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Finding the Fourth Proportional to 151.10, 208.56 and 85.65

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Solution

The fourth proportional to 151.10, 208.56 and 85.65 is: 118.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.10 : 208.56 = 85.65 : x
  2. Step 2: Convert to fraction form
    151.10/208.56 = 85.65/x
  3. Step 3: Cross multiply
    151.10x = 208.56 × 85.65
  4. Step 4: Simplify right side
    151.10x = 17,862.70
  5. Step 5: Solve for x
    x = 17,862.70/151.10
  6. Step 6: Final answer
    x = 118.22

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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.