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Finding the Fourth Proportional to 67,909.80, 101,855.10 and 21,167.40

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Solution

The fourth proportional to 67,909.80, 101,855.10 and 21,167.40 is: 31,748.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,909.80 : 101,855.10 = 21,167.40 : x
  2. Step 2: Convert to fraction form
    67,909.80/101,855.10 = 21,167.40/x
  3. Step 3: Cross multiply
    67,909.80x = 101,855.10 × 21,167.40
  4. Step 4: Simplify right side
    67,909.80x = 2,156,007,643.74
  5. Step 5: Solve for x
    x = 2,156,007,643.74/67,909.80
  6. Step 6: Final answer
    x = 31,748.11

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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.