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Finding the Fourth Proportional to 316.57, 474.86 and 143.21

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Solution

The fourth proportional to 316.57, 474.86 and 143.21 is: 214.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.57 : 474.86 = 143.21 : x
  2. Step 2: Convert to fraction form
    316.57/474.86 = 143.21/x
  3. Step 3: Cross multiply
    316.57x = 474.86 × 143.21
  4. Step 4: Simplify right side
    316.57x = 68,004.70
  5. Step 5: Solve for x
    x = 68,004.70/316.57
  6. Step 6: Final answer
    x = 214.82

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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.