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Finding the Fourth Proportional to 67,134.72, 100,702.40 and 20,388

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Solution

The fourth proportional to 67,134.72, 100,702.40 and 20,388 is: 30,582.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,134.72 : 100,702.40 = 20,388 : x
  2. Step 2: Convert to fraction form
    67,134.72/100,702.40 = 20,388/x
  3. Step 3: Cross multiply
    67,134.72x = 100,702.40 × 20,388
  4. Step 4: Simplify right side
    67,134.72x = 2,053,120,531.20
  5. Step 5: Solve for x
    x = 2,053,120,531.20/67,134.72
  6. Step 6: Final answer
    x = 30,582.10

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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.