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Finding the Fourth Proportional to 354.31, 531.57 and 148.78

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Solution

The fourth proportional to 354.31, 531.57 and 148.78 is: 223.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.31 : 531.57 = 148.78 : x
  2. Step 2: Convert to fraction form
    354.31/531.57 = 148.78/x
  3. Step 3: Cross multiply
    354.31x = 531.57 × 148.78
  4. Step 4: Simplify right side
    354.31x = 79,084.80
  5. Step 5: Solve for x
    x = 79,084.80/354.31
  6. Step 6: Final answer
    x = 223.21

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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.