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Finding the Fourth Proportional to 316.63, 474.89 and 85.55

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Solution

The fourth proportional to 316.63, 474.89 and 85.55 is: 128.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.63 : 474.89 = 85.55 : x
  2. Step 2: Convert to fraction form
    316.63/474.89 = 85.55/x
  3. Step 3: Cross multiply
    316.63x = 474.89 × 85.55
  4. Step 4: Simplify right side
    316.63x = 40,624.68
  5. Step 5: Solve for x
    x = 40,624.68/316.63
  6. Step 6: Final answer
    x = 128.30

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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.