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Finding the Fourth Proportional to 138,808.36, 208,247.10 and 79,681.96

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Solution

The fourth proportional to 138,808.36, 208,247.10 and 79,681.96 is: 119,542.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,808.36 : 208,247.10 = 79,681.96 : x
  2. Step 2: Convert to fraction form
    138,808.36/208,247.10 = 79,681.96/x
  3. Step 3: Cross multiply
    138,808.36x = 208,247.10 × 79,681.96
  4. Step 4: Simplify right side
    138,808.36x = 16,593,537,092.32
  5. Step 5: Solve for x
    x = 16,593,537,092.32/138,808.36
  6. Step 6: Final answer
    x = 119,542.78

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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.