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Finding the Fourth Proportional to 151.61, 209.01 and 128.20

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Solution

The fourth proportional to 151.61, 209.01 and 128.20 is: 176.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.61 : 209.01 = 128.20 : x
  2. Step 2: Convert to fraction form
    151.61/209.01 = 128.20/x
  3. Step 3: Cross multiply
    151.61x = 209.01 × 128.20
  4. Step 4: Simplify right side
    151.61x = 26,795.32
  5. Step 5: Solve for x
    x = 26,795.32/151.61
  6. Step 6: Final answer
    x = 176.74

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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.