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Finding the Fourth Proportional to 175.46, 242.46 and 128.88

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Solution

The fourth proportional to 175.46, 242.46 and 128.88 is: 178.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    175.46 : 242.46 = 128.88 : x
  2. Step 2: Convert to fraction form
    175.46/242.46 = 128.88/x
  3. Step 3: Cross multiply
    175.46x = 242.46 × 128.88
  4. Step 4: Simplify right side
    175.46x = 31,248.24
  5. Step 5: Solve for x
    x = 31,248.24/175.46
  6. Step 6: Final answer
    x = 178.10

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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.