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Finding the Fourth Proportional to 318.65, 477.99 and 99.25

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Solution

The fourth proportional to 318.65, 477.99 and 99.25 is: 148.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.65 : 477.99 = 99.25 : x
  2. Step 2: Convert to fraction form
    318.65/477.99 = 99.25/x
  3. Step 3: Cross multiply
    318.65x = 477.99 × 99.25
  4. Step 4: Simplify right side
    318.65x = 47,439.31
  5. Step 5: Solve for x
    x = 47,439.31/318.65
  6. Step 6: Final answer
    x = 148.88

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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.