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Finding the Fourth Proportional to 318.55, 477.89 and 99.17

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Solution

The fourth proportional to 318.55, 477.89 and 99.17 is: 148.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.55 : 477.89 = 99.17 : x
  2. Step 2: Convert to fraction form
    318.55/477.89 = 99.17/x
  3. Step 3: Cross multiply
    318.55x = 477.89 × 99.17
  4. Step 4: Simplify right side
    318.55x = 47,392.35
  5. Step 5: Solve for x
    x = 47,392.35/318.55
  6. Step 6: Final answer
    x = 148.78

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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.