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Finding the Fourth Proportional to 864.11, 1,296.17 and 316.29

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Solution

The fourth proportional to 864.11, 1,296.17 and 316.29 is: 474.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.11 : 1,296.17 = 316.29 : x
  2. Step 2: Convert to fraction form
    864.11/1,296.17 = 316.29/x
  3. Step 3: Cross multiply
    864.11x = 1,296.17 × 316.29
  4. Step 4: Simplify right side
    864.11x = 409,965.61
  5. Step 5: Solve for x
    x = 409,965.61/864.11
  6. Step 6: Final answer
    x = 474.44

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Double scale
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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.