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Finding the Fourth Proportional to 663,622.60, 915,772.81 and 391,778.06

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Solution

The fourth proportional to 663,622.60, 915,772.81 and 391,778.06 is: 540,638.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,622.60 : 915,772.81 = 391,778.06 : x
  2. Step 2: Convert to fraction form
    663,622.60/915,772.81 = 391,778.06/x
  3. Step 3: Cross multiply
    663,622.60x = 915,772.81 × 391,778.06
  4. Step 4: Simplify right side
    663,622.60x = 358,779,694,902.55
  5. Step 5: Solve for x
    x = 358,779,694,902.55/663,622.60
  6. Step 6: Final answer
    x = 540,638.15

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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.