Home / 138,679.85-208,149.78-72,167.10

Finding the Fourth Proportional to 138,679.85, 208,149.78 and 72,167.10

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Solution

The fourth proportional to 138,679.85, 208,149.78 and 72,167.10 is: 108,318.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,679.85 : 208,149.78 = 72,167.10 : x
  2. Step 2: Convert to fraction form
    138,679.85/208,149.78 = 72,167.10/x
  3. Step 3: Cross multiply
    138,679.85x = 208,149.78 × 72,167.10
  4. Step 4: Simplify right side
    138,679.85x = 15,021,565,988.24
  5. Step 5: Solve for x
    x = 15,021,565,988.24/138,679.85
  6. Step 6: Final answer
    x = 108,318.31

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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.