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Finding the Fourth Proportional to 354.80, 531.88 and 138.52

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Solution

The fourth proportional to 354.80, 531.88 and 138.52 is: 207.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.80 : 531.88 = 138.52 : x
  2. Step 2: Convert to fraction form
    354.80/531.88 = 138.52/x
  3. Step 3: Cross multiply
    354.80x = 531.88 × 138.52
  4. Step 4: Simplify right side
    354.80x = 73,676.02
  5. Step 5: Solve for x
    x = 73,676.02/354.80
  6. Step 6: Final answer
    x = 207.66

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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.