Home / 521,981.40-782,972.10-389,121.15

Finding the Fourth Proportional to 521,981.40, 782,972.10 and 389,121.15

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Solution

The fourth proportional to 521,981.40, 782,972.10 and 389,121.15 is: 583,681.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,981.40 : 782,972.10 = 389,121.15 : x
  2. Step 2: Convert to fraction form
    521,981.40/782,972.10 = 389,121.15/x
  3. Step 3: Cross multiply
    521,981.40x = 782,972.10 × 389,121.15
  4. Step 4: Simplify right side
    521,981.40x = 304,671,003,969.92
  5. Step 5: Solve for x
    x = 304,671,003,969.92/521,981.40
  6. Step 6: Final answer
    x = 583,681.73

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Half scale
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Double scale
Find fourth proportional to 521,982.40, 782,973.60 and 389,122.15
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.