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Finding the Fourth Proportional to 91,987.20, 137,689.20 and 65,743.20

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Solution

The fourth proportional to 91,987.20, 137,689.20 and 65,743.20 is: 98,406.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,987.20 : 137,689.20 = 65,743.20 : x
  2. Step 2: Convert to fraction form
    91,987.20/137,689.20 = 65,743.20/x
  3. Step 3: Cross multiply
    91,987.20x = 137,689.20 × 65,743.20
  4. Step 4: Simplify right side
    91,987.20x = 9,052,128,613.44
  5. Step 5: Solve for x
    x = 9,052,128,613.44/91,987.20
  6. Step 6: Final answer
    x = 98,406.39

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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.