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Finding the Fourth Proportional to 151.39, 208.78 and 102.34

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Solution

The fourth proportional to 151.39, 208.78 and 102.34 is: 141.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.39 : 208.78 = 102.34 : x
  2. Step 2: Convert to fraction form
    151.39/208.78 = 102.34/x
  3. Step 3: Cross multiply
    151.39x = 208.78 × 102.34
  4. Step 4: Simplify right side
    151.39x = 21,366.55
  5. Step 5: Solve for x
    x = 21,366.55/151.39
  6. Step 6: Final answer
    x = 141.14

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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.