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Finding the Fourth Proportional to 150.76, 207.57 and 128.59

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Solution

The fourth proportional to 150.76, 207.57 and 128.59 is: 177.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.76 : 207.57 = 128.59 : x
  2. Step 2: Convert to fraction form
    150.76/207.57 = 128.59/x
  3. Step 3: Cross multiply
    150.76x = 207.57 × 128.59
  4. Step 4: Simplify right side
    150.76x = 26,691.43
  5. Step 5: Solve for x
    x = 26,691.43/150.76
  6. Step 6: Final answer
    x = 177.05

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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.