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Finding the Fourth Proportional to 318.43, 477.56 and 87.30

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Solution

The fourth proportional to 318.43, 477.56 and 87.30 is: 130.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.43 : 477.56 = 87.30 : x
  2. Step 2: Convert to fraction form
    318.43/477.56 = 87.30/x
  3. Step 3: Cross multiply
    318.43x = 477.56 × 87.30
  4. Step 4: Simplify right side
    318.43x = 41,690.99
  5. Step 5: Solve for x
    x = 41,690.99/318.43
  6. Step 6: Final answer
    x = 130.93

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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.