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Finding the Fourth Proportional to 71,721.12, 107,493.84 and 40,490.40

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Solution

The fourth proportional to 71,721.12, 107,493.84 and 40,490.40 is: 60,686.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,721.12 : 107,493.84 = 40,490.40 : x
  2. Step 2: Convert to fraction form
    71,721.12/107,493.84 = 40,490.40/x
  3. Step 3: Cross multiply
    71,721.12x = 107,493.84 × 40,490.40
  4. Step 4: Simplify right side
    71,721.12x = 4,352,468,579.14
  5. Step 5: Solve for x
    x = 4,352,468,579.14/71,721.12
  6. Step 6: Final answer
    x = 60,686.01

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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.