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Finding the Fourth Proportional to 351.72, 527.66 and 143.45

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Solution

The fourth proportional to 351.72, 527.66 and 143.45 is: 215.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.72 : 527.66 = 143.45 : x
  2. Step 2: Convert to fraction form
    351.72/527.66 = 143.45/x
  3. Step 3: Cross multiply
    351.72x = 527.66 × 143.45
  4. Step 4: Simplify right side
    351.72x = 75,689.47
  5. Step 5: Solve for x
    x = 75,689.47/351.72
  6. Step 6: Final answer
    x = 215.20

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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.