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Finding the Fourth Proportional to 249.86, 374.87 and 128.21

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Solution

The fourth proportional to 249.86, 374.87 and 128.21 is: 192.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.86 : 374.87 = 128.21 : x
  2. Step 2: Convert to fraction form
    249.86/374.87 = 128.21/x
  3. Step 3: Cross multiply
    249.86x = 374.87 × 128.21
  4. Step 4: Simplify right side
    249.86x = 48,062.08
  5. Step 5: Solve for x
    x = 48,062.08/249.86
  6. Step 6: Final answer
    x = 192.36

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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.