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Finding the Fourth Proportional to 152.23, 209.89 and 128.88

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Solution

The fourth proportional to 152.23, 209.89 and 128.88 is: 177.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.23 : 209.89 = 128.88 : x
  2. Step 2: Convert to fraction form
    152.23/209.89 = 128.88/x
  3. Step 3: Cross multiply
    152.23x = 209.89 × 128.88
  4. Step 4: Simplify right side
    152.23x = 27,050.62
  5. Step 5: Solve for x
    x = 27,050.62/152.23
  6. Step 6: Final answer
    x = 177.70

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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.