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Finding the Fourth Proportional to 151.99, 209.66 and 102.78

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Solution

The fourth proportional to 151.99, 209.66 and 102.78 is: 141.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.99 : 209.66 = 102.78 : x
  2. Step 2: Convert to fraction form
    151.99/209.66 = 102.78/x
  3. Step 3: Cross multiply
    151.99x = 209.66 × 102.78
  4. Step 4: Simplify right side
    151.99x = 21,548.34
  5. Step 5: Solve for x
    x = 21,548.34/151.99
  6. Step 6: Final answer
    x = 141.78

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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.