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Finding the Fourth Proportional to 131,720.88, 181,757.88 and 75,128.88

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Solution

The fourth proportional to 131,720.88, 181,757.88 and 75,128.88 is: 103,668.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,720.88 : 181,757.88 = 75,128.88 : x
  2. Step 2: Convert to fraction form
    131,720.88/181,757.88 = 75,128.88/x
  3. Step 3: Cross multiply
    131,720.88x = 181,757.88 × 75,128.88
  4. Step 4: Simplify right side
    131,720.88x = 13,655,265,955.57
  5. Step 5: Solve for x
    x = 13,655,265,955.57/131,720.88
  6. Step 6: Final answer
    x = 103,668.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.