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Finding the Fourth Proportional to 318.53, 477.83 and 87.42

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Solution

The fourth proportional to 318.53, 477.83 and 87.42 is: 131.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.53 : 477.83 = 87.42 : x
  2. Step 2: Convert to fraction form
    318.53/477.83 = 87.42/x
  3. Step 3: Cross multiply
    318.53x = 477.83 × 87.42
  4. Step 4: Simplify right side
    318.53x = 41,771.90
  5. Step 5: Solve for x
    x = 41,771.90/318.53
  6. Step 6: Final answer
    x = 131.14

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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.