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Finding the Fourth Proportional to 100,912.53, 139,248.83 and 62,144.20

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Solution

The fourth proportional to 100,912.53, 139,248.83 and 62,144.20 is: 85,752.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,912.53 : 139,248.83 = 62,144.20 : x
  2. Step 2: Convert to fraction form
    100,912.53/139,248.83 = 62,144.20/x
  3. Step 3: Cross multiply
    100,912.53x = 139,248.83 × 62,144.20
  4. Step 4: Simplify right side
    100,912.53x = 8,653,506,445.04
  5. Step 5: Solve for x
    x = 8,653,506,445.04/100,912.53
  6. Step 6: Final answer
    x = 85,752.55

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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.