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Finding the Fourth Proportional to 354.49, 531.78 and 123.43

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Solution

The fourth proportional to 354.49, 531.78 and 123.43 is: 185.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.49 : 531.78 = 123.43 : x
  2. Step 2: Convert to fraction form
    354.49/531.78 = 123.43/x
  3. Step 3: Cross multiply
    354.49x = 531.78 × 123.43
  4. Step 4: Simplify right side
    354.49x = 65,637.61
  5. Step 5: Solve for x
    x = 65,637.61/354.49
  6. Step 6: Final answer
    x = 185.16

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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.