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Finding the Fourth Proportional to 354.30, 531.12 and 137.72

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Solution

The fourth proportional to 354.30, 531.12 and 137.72 is: 206.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.30 : 531.12 = 137.72 : x
  2. Step 2: Convert to fraction form
    354.30/531.12 = 137.72/x
  3. Step 3: Cross multiply
    354.30x = 531.12 × 137.72
  4. Step 4: Simplify right side
    354.30x = 73,145.85
  5. Step 5: Solve for x
    x = 73,145.85/354.30
  6. Step 6: Final answer
    x = 206.45

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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.