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Finding the Fourth Proportional to 354.48, 531.86 and 138.12

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Solution

The fourth proportional to 354.48, 531.86 and 138.12 is: 207.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.48 : 531.86 = 138.12 : x
  2. Step 2: Convert to fraction form
    354.48/531.86 = 138.12/x
  3. Step 3: Cross multiply
    354.48x = 531.86 × 138.12
  4. Step 4: Simplify right side
    354.48x = 73,460.50
  5. Step 5: Solve for x
    x = 73,460.50/354.48
  6. Step 6: Final answer
    x = 207.23

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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.