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Finding the Fourth Proportional to 152.91, 229.71 and 128.76

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Solution

The fourth proportional to 152.91, 229.71 and 128.76 is: 193.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.91 : 229.71 = 128.76 : x
  2. Step 2: Convert to fraction form
    152.91/229.71 = 128.76/x
  3. Step 3: Cross multiply
    152.91x = 229.71 × 128.76
  4. Step 4: Simplify right side
    152.91x = 29,577.46
  5. Step 5: Solve for x
    x = 29,577.46/152.91
  6. Step 6: Final answer
    x = 193.43

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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.