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Finding the Fourth Proportional to 99,792.80, 137,729.20 and 62,079.20

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Solution

The fourth proportional to 99,792.80, 137,729.20 and 62,079.20 is: 85,678.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,792.80 : 137,729.20 = 62,079.20 : x
  2. Step 2: Convert to fraction form
    99,792.80/137,729.20 = 62,079.20/x
  3. Step 3: Cross multiply
    99,792.80x = 137,729.20 × 62,079.20
  4. Step 4: Simplify right side
    99,792.80x = 8,550,118,552.64
  5. Step 5: Solve for x
    x = 8,550,118,552.64/99,792.80
  6. Step 6: Final answer
    x = 85,678.71

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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.