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Finding the Fourth Proportional to 72,689.72, 108,989.92 and 28,264.68

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Solution

The fourth proportional to 72,689.72, 108,989.92 and 28,264.68 is: 42,379.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,689.72 : 108,989.92 = 28,264.68 : x
  2. Step 2: Convert to fraction form
    72,689.72/108,989.92 = 28,264.68/x
  3. Step 3: Cross multiply
    72,689.72x = 108,989.92 × 28,264.68
  4. Step 4: Simplify right side
    72,689.72x = 3,080,565,766.78
  5. Step 5: Solve for x
    x = 3,080,565,766.78/72,689.72
  6. Step 6: Final answer
    x = 42,379.66

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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.