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Finding the Fourth Proportional to 316.98, 475.41 and 85.88

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Solution

The fourth proportional to 316.98, 475.41 and 85.88 is: 128.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.98 : 475.41 = 85.88 : x
  2. Step 2: Convert to fraction form
    316.98/475.41 = 85.88/x
  3. Step 3: Cross multiply
    316.98x = 475.41 × 85.88
  4. Step 4: Simplify right side
    316.98x = 40,825.83
  5. Step 5: Solve for x
    x = 40,825.83/316.98
  6. Step 6: Final answer
    x = 128.80

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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.