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Finding the Fourth Proportional to 864.80, 1,296.42 and 316.61

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Solution

The fourth proportional to 864.80, 1,296.42 and 316.61 is: 474.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.80 : 1,296.42 = 316.61 : x
  2. Step 2: Convert to fraction form
    864.80/1,296.42 = 316.61/x
  3. Step 3: Cross multiply
    864.80x = 1,296.42 × 316.61
  4. Step 4: Simplify right side
    864.80x = 410,453.05
  5. Step 5: Solve for x
    x = 410,453.05/864.80
  6. Step 6: Final answer
    x = 474.62

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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.