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Finding the Fourth Proportional to 521,930.76, 720,611.40 and 400,855.68

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Solution

The fourth proportional to 521,930.76, 720,611.40 and 400,855.68 is: 553,447.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,930.76 : 720,611.40 = 400,855.68 : x
  2. Step 2: Convert to fraction form
    521,930.76/720,611.40 = 400,855.68/x
  3. Step 3: Cross multiply
    521,930.76x = 720,611.40 × 400,855.68
  4. Step 4: Simplify right side
    521,930.76x = 288,861,172,762.75
  5. Step 5: Solve for x
    x = 288,861,172,762.75/521,930.76
  6. Step 6: Final answer
    x = 553,447.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.