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Finding the Fourth Proportional to 99,793.20, 137,719.80 and 57,355.68

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Solution

The fourth proportional to 99,793.20, 137,719.80 and 57,355.68 is: 79,153.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,793.20 : 137,719.80 = 57,355.68 : x
  2. Step 2: Convert to fraction form
    99,793.20/137,719.80 = 57,355.68/x
  3. Step 3: Cross multiply
    99,793.20x = 137,719.80 × 57,355.68
  4. Step 4: Simplify right side
    99,793.20x = 7,899,012,778.46
  5. Step 5: Solve for x
    x = 7,899,012,778.46/99,793.20
  6. Step 6: Final answer
    x = 79,153.82

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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.