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Finding the Fourth Proportional to 175.90, 242.82 and 129.28

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Solution

The fourth proportional to 175.90, 242.82 and 129.28 is: 178.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    175.90 : 242.82 = 129.28 : x
  2. Step 2: Convert to fraction form
    175.90/242.82 = 129.28/x
  3. Step 3: Cross multiply
    175.90x = 242.82 × 129.28
  4. Step 4: Simplify right side
    175.90x = 31,391.77
  5. Step 5: Solve for x
    x = 31,391.77/175.90
  6. Step 6: Final answer
    x = 178.46

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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.