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Finding the Fourth Proportional to 663,439.68, 915,512.22 and 376,920

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Solution

The fourth proportional to 663,439.68, 915,512.22 and 376,920 is: 520,129.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,439.68 : 915,512.22 = 376,920 : x
  2. Step 2: Convert to fraction form
    663,439.68/915,512.22 = 376,920/x
  3. Step 3: Cross multiply
    663,439.68x = 915,512.22 × 376,920
  4. Step 4: Simplify right side
    663,439.68x = 345,074,865,962.40
  5. Step 5: Solve for x
    x = 345,074,865,962.40/663,439.68
  6. Step 6: Final answer
    x = 520,129.98

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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.