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Finding the Fourth Proportional to 316.90, 475.15 and 131.89

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Solution

The fourth proportional to 316.90, 475.15 and 131.89 is: 197.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.90 : 475.15 = 131.89 : x
  2. Step 2: Convert to fraction form
    316.90/475.15 = 131.89/x
  3. Step 3: Cross multiply
    316.90x = 475.15 × 131.89
  4. Step 4: Simplify right side
    316.90x = 62,669.46
  5. Step 5: Solve for x
    x = 62,669.46/316.90
  6. Step 6: Final answer
    x = 197.76

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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.