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Finding the Fourth Proportional to 318.30, 477.46 and 87.22

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Solution

The fourth proportional to 318.30, 477.46 and 87.22 is: 130.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.30 : 477.46 = 87.22 : x
  2. Step 2: Convert to fraction form
    318.30/477.46 = 87.22/x
  3. Step 3: Cross multiply
    318.30x = 477.46 × 87.22
  4. Step 4: Simplify right side
    318.30x = 41,644.06
  5. Step 5: Solve for x
    x = 41,644.06/318.30
  6. Step 6: Final answer
    x = 130.83

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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.