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Finding the Fourth Proportional to 151.32, 208.90 and 142.05

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Solution

The fourth proportional to 151.32, 208.90 and 142.05 is: 196.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.32 : 208.90 = 142.05 : x
  2. Step 2: Convert to fraction form
    151.32/208.90 = 142.05/x
  3. Step 3: Cross multiply
    151.32x = 208.90 × 142.05
  4. Step 4: Simplify right side
    151.32x = 29,675.61
  5. Step 5: Solve for x
    x = 29,675.61/151.32
  6. Step 6: Final answer
    x = 196.11

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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.