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Finding the Fourth Proportional to 98,920.78, 136,558 and 56,471.12

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Solution

The fourth proportional to 98,920.78, 136,558 and 56,471.12 is: 77,957.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,920.78 : 136,558 = 56,471.12 : x
  2. Step 2: Convert to fraction form
    98,920.78/136,558 = 56,471.12/x
  3. Step 3: Cross multiply
    98,920.78x = 136,558 × 56,471.12
  4. Step 4: Simplify right side
    98,920.78x = 7,711,583,204.96
  5. Step 5: Solve for x
    x = 7,711,583,204.96/98,920.78
  6. Step 6: Final answer
    x = 77,957.16

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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.