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Finding the Fourth Proportional to 212.47, 318.40 and 166.91

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Solution

The fourth proportional to 212.47, 318.40 and 166.91 is: 250.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.47 : 318.40 = 166.91 : x
  2. Step 2: Convert to fraction form
    212.47/318.40 = 166.91/x
  3. Step 3: Cross multiply
    212.47x = 318.40 × 166.91
  4. Step 4: Simplify right side
    212.47x = 53,141.72
  5. Step 5: Solve for x
    x = 53,141.72/212.47
  6. Step 6: Final answer
    x = 250.12

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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.