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Finding the Fourth Proportional to 137,913.20, 206,869.80 and 67,929.20

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Solution

The fourth proportional to 137,913.20, 206,869.80 and 67,929.20 is: 101,893.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,913.20 : 206,869.80 = 67,929.20 : x
  2. Step 2: Convert to fraction form
    137,913.20/206,869.80 = 67,929.20/x
  3. Step 3: Cross multiply
    137,913.20x = 206,869.80 × 67,929.20
  4. Step 4: Simplify right side
    137,913.20x = 14,052,500,018.16
  5. Step 5: Solve for x
    x = 14,052,500,018.16/137,913.20
  6. Step 6: Final answer
    x = 101,893.80

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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.