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Finding the Fourth Proportional to 99,720, 137,616.18 and 54,398.73

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Solution

The fourth proportional to 99,720, 137,616.18 and 54,398.73 is: 75,071.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,720 : 137,616.18 = 54,398.73 : x
  2. Step 2: Convert to fraction form
    99,720/137,616.18 = 54,398.73/x
  3. Step 3: Cross multiply
    99,720x = 137,616.18 × 54,398.73
  4. Step 4: Simplify right side
    99,720x = 7,486,145,419.45
  5. Step 5: Solve for x
    x = 7,486,145,419.45/99,720
  6. Step 6: Final answer
    x = 75,071.65

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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.