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Finding the Fourth Proportional to 249.35, 374.07 and 87.15

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Solution

The fourth proportional to 249.35, 374.07 and 87.15 is: 130.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.35 : 374.07 = 87.15 : x
  2. Step 2: Convert to fraction form
    249.35/374.07 = 87.15/x
  3. Step 3: Cross multiply
    249.35x = 374.07 × 87.15
  4. Step 4: Simplify right side
    249.35x = 32,599.12
  5. Step 5: Solve for x
    x = 32,599.12/249.35
  6. Step 6: Final answer
    x = 130.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.