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Finding the Fourth Proportional to 331.74, 497.55 and 126.30

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Solution

The fourth proportional to 331.74, 497.55 and 126.30 is: 189.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.74 : 497.55 = 126.30 : x
  2. Step 2: Convert to fraction form
    331.74/497.55 = 126.30/x
  3. Step 3: Cross multiply
    331.74x = 497.55 × 126.30
  4. Step 4: Simplify right side
    331.74x = 62,840.57
  5. Step 5: Solve for x
    x = 62,840.57/331.74
  6. Step 6: Final answer
    x = 189.43

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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.