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Finding the Fourth Proportional to 521,611.40, 782,417.10 and 395,640.20

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Solution

The fourth proportional to 521,611.40, 782,417.10 and 395,640.20 is: 593,460.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,611.40 : 782,417.10 = 395,640.20 : x
  2. Step 2: Convert to fraction form
    521,611.40/782,417.10 = 395,640.20/x
  3. Step 3: Cross multiply
    521,611.40x = 782,417.10 × 395,640.20
  4. Step 4: Simplify right side
    521,611.40x = 309,555,657,927.42
  5. Step 5: Solve for x
    x = 309,555,657,927.42/521,611.40
  6. Step 6: Final answer
    x = 593,460.30

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Double scale
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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.