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Finding the Fourth Proportional to 72,990.60, 109,489.14 and 28,613.40

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Solution

The fourth proportional to 72,990.60, 109,489.14 and 28,613.40 is: 42,921.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,990.60 : 109,489.14 = 28,613.40 : x
  2. Step 2: Convert to fraction form
    72,990.60/109,489.14 = 28,613.40/x
  3. Step 3: Cross multiply
    72,990.60x = 109,489.14 × 28,613.40
  4. Step 4: Simplify right side
    72,990.60x = 3,132,856,558.48
  5. Step 5: Solve for x
    x = 3,132,856,558.48/72,990.60
  6. Step 6: Final answer
    x = 42,921.37

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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.