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Finding the Fourth Proportional to 249.90, 375 and 87.72

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Solution

The fourth proportional to 249.90, 375 and 87.72 is: 131.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.90 : 375 = 87.72 : x
  2. Step 2: Convert to fraction form
    249.90/375 = 87.72/x
  3. Step 3: Cross multiply
    249.90x = 375 × 87.72
  4. Step 4: Simplify right side
    249.90x = 32,895
  5. Step 5: Solve for x
    x = 32,895/249.90
  6. Step 6: Final answer
    x = 131.63

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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.