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Finding the Fourth Proportional to 71,248.60, 106,872.90 and 18,663.40

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Solution

The fourth proportional to 71,248.60, 106,872.90 and 18,663.40 is: 27,995.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,248.60 : 106,872.90 = 18,663.40 : x
  2. Step 2: Convert to fraction form
    71,248.60/106,872.90 = 18,663.40/x
  3. Step 3: Cross multiply
    71,248.60x = 106,872.90 × 18,663.40
  4. Step 4: Simplify right side
    71,248.60x = 1,994,611,681.86
  5. Step 5: Solve for x
    x = 1,994,611,681.86/71,248.60
  6. Step 6: Final answer
    x = 27,995.10

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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.