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Finding the Fourth Proportional to 354.61, 531.61 and 138.16

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Solution

The fourth proportional to 354.61, 531.61 and 138.16 is: 207.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.61 : 531.61 = 138.16 : x
  2. Step 2: Convert to fraction form
    354.61/531.61 = 138.16/x
  3. Step 3: Cross multiply
    354.61x = 531.61 × 138.16
  4. Step 4: Simplify right side
    354.61x = 73,447.24
  5. Step 5: Solve for x
    x = 73,447.24/354.61
  6. Step 6: Final answer
    x = 207.12

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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.