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Finding the Fourth Proportional to 316.64, 474.96 and 143.30

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Solution

The fourth proportional to 316.64, 474.96 and 143.30 is: 214.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.64 : 474.96 = 143.30 : x
  2. Step 2: Convert to fraction form
    316.64/474.96 = 143.30/x
  3. Step 3: Cross multiply
    316.64x = 474.96 × 143.30
  4. Step 4: Simplify right side
    316.64x = 68,063.49
  5. Step 5: Solve for x
    x = 68,063.49/316.64
  6. Step 6: Final answer
    x = 214.95

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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.