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Finding the Fourth Proportional to 249.98, 375.20 and 128.32

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Solution

The fourth proportional to 249.98, 375.20 and 128.32 is: 192.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.98 : 375.20 = 128.32 : x
  2. Step 2: Convert to fraction form
    249.98/375.20 = 128.32/x
  3. Step 3: Cross multiply
    249.98x = 375.20 × 128.32
  4. Step 4: Simplify right side
    249.98x = 48,145.66
  5. Step 5: Solve for x
    x = 48,145.66/249.98
  6. Step 6: Final answer
    x = 192.60

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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.