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Finding the Fourth Proportional to 71,160.20, 106,758.78 and 21,240.30

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Solution

The fourth proportional to 71,160.20, 106,758.78 and 21,240.30 is: 31,865.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,160.20 : 106,758.78 = 21,240.30 : x
  2. Step 2: Convert to fraction form
    71,160.20/106,758.78 = 21,240.30/x
  3. Step 3: Cross multiply
    71,160.20x = 106,758.78 × 21,240.30
  4. Step 4: Simplify right side
    71,160.20x = 2,267,588,714.48
  5. Step 5: Solve for x
    x = 2,267,588,714.48/71,160.20
  6. Step 6: Final answer
    x = 31,865.97

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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.