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Finding the Fourth Proportional to 318.13, 477.18 and 171.65

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Solution

The fourth proportional to 318.13, 477.18 and 171.65 is: 257.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.13 : 477.18 = 171.65 : x
  2. Step 2: Convert to fraction form
    318.13/477.18 = 171.65/x
  3. Step 3: Cross multiply
    318.13x = 477.18 × 171.65
  4. Step 4: Simplify right side
    318.13x = 81,909.14
  5. Step 5: Solve for x
    x = 81,909.14/318.13
  6. Step 6: Final answer
    x = 257.47

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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.