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Finding the Fourth Proportional to 91,419.80, 137,129.70 and 72,987.80

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Solution

The fourth proportional to 91,419.80, 137,129.70 and 72,987.80 is: 109,481.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,419.80 : 137,129.70 = 72,987.80 : x
  2. Step 2: Convert to fraction form
    91,419.80/137,129.70 = 72,987.80/x
  3. Step 3: Cross multiply
    91,419.80x = 137,129.70 × 72,987.80
  4. Step 4: Simplify right side
    91,419.80x = 10,008,795,117.66
  5. Step 5: Solve for x
    x = 10,008,795,117.66/91,419.80
  6. Step 6: Final answer
    x = 109,481.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.