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Finding the Fourth Proportional to 318.32, 477.43 and 87.23

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Solution

The fourth proportional to 318.32, 477.43 and 87.23 is: 130.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.32 : 477.43 = 87.23 : x
  2. Step 2: Convert to fraction form
    318.32/477.43 = 87.23/x
  3. Step 3: Cross multiply
    318.32x = 477.43 × 87.23
  4. Step 4: Simplify right side
    318.32x = 41,646.66
  5. Step 5: Solve for x
    x = 41,646.66/318.32
  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.