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Finding the Fourth Proportional to 318.49, 477.78 and 99.13

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Solution

The fourth proportional to 318.49, 477.78 and 99.13 is: 148.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.49 : 477.78 = 99.13 : x
  2. Step 2: Convert to fraction form
    318.49/477.78 = 99.13/x
  3. Step 3: Cross multiply
    318.49x = 477.78 × 99.13
  4. Step 4: Simplify right side
    318.49x = 47,361.84
  5. Step 5: Solve for x
    x = 47,361.84/318.49
  6. Step 6: Final answer
    x = 148.71

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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.