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Finding the Fourth Proportional to 138,700.80, 208,051.20 and 115,372.80

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Solution

The fourth proportional to 138,700.80, 208,051.20 and 115,372.80 is: 173,059.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,700.80 : 208,051.20 = 115,372.80 : x
  2. Step 2: Convert to fraction form
    138,700.80/208,051.20 = 115,372.80/x
  3. Step 3: Cross multiply
    138,700.80x = 208,051.20 × 115,372.80
  4. Step 4: Simplify right side
    138,700.80x = 24,003,449,487.36
  5. Step 5: Solve for x
    x = 24,003,449,487.36/138,700.80
  6. Step 6: Final answer
    x = 173,059.20

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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.