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Finding the Fourth Proportional to 249.61, 374.47 and 85.07

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Solution

The fourth proportional to 249.61, 374.47 and 85.07 is: 127.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.61 : 374.47 = 85.07 : x
  2. Step 2: Convert to fraction form
    249.61/374.47 = 85.07/x
  3. Step 3: Cross multiply
    249.61x = 374.47 × 85.07
  4. Step 4: Simplify right side
    249.61x = 31,856.16
  5. Step 5: Solve for x
    x = 31,856.16/249.61
  6. Step 6: Final answer
    x = 127.63

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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.