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Finding the Fourth Proportional to 151.25, 208.70 and 84.86

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Solution

The fourth proportional to 151.25, 208.70 and 84.86 is: 117.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.25 : 208.70 = 84.86 : x
  2. Step 2: Convert to fraction form
    151.25/208.70 = 84.86/x
  3. Step 3: Cross multiply
    151.25x = 208.70 × 84.86
  4. Step 4: Simplify right side
    151.25x = 17,710.28
  5. Step 5: Solve for x
    x = 17,710.28/151.25
  6. Step 6: Final answer
    x = 117.09

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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.