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Finding the Fourth Proportional to 151.76, 209.44 and 85.38

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Solution

The fourth proportional to 151.76, 209.44 and 85.38 is: 117.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.76 : 209.44 = 85.38 : x
  2. Step 2: Convert to fraction form
    151.76/209.44 = 85.38/x
  3. Step 3: Cross multiply
    151.76x = 209.44 × 85.38
  4. Step 4: Simplify right side
    151.76x = 17,880.83
  5. Step 5: Solve for x
    x = 17,880.83/151.76
  6. Step 6: Final answer
    x = 117.83

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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.