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Finding the Fourth Proportional to 521,920.25, 720,596.91 and 400,845.20

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Solution

The fourth proportional to 521,920.25, 720,596.91 and 400,845.20 is: 553,432.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,920.25 : 720,596.91 = 400,845.20 : x
  2. Step 2: Convert to fraction form
    521,920.25/720,596.91 = 400,845.20/x
  3. Step 3: Cross multiply
    521,920.25x = 720,596.91 × 400,845.20
  4. Step 4: Simplify right side
    521,920.25x = 288,847,808,905.35
  5. Step 5: Solve for x
    x = 288,847,808,905.35/521,920.25
  6. Step 6: Final answer
    x = 553,432.85

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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.