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Finding the Fourth Proportional to 864.16, 1,296.43 and 316.33

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Solution

The fourth proportional to 864.16, 1,296.43 and 316.33 is: 474.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.16 : 1,296.43 = 316.33 : x
  2. Step 2: Convert to fraction form
    864.16/1,296.43 = 316.33/x
  3. Step 3: Cross multiply
    864.16x = 1,296.43 × 316.33
  4. Step 4: Simplify right side
    864.16x = 410,099.70
  5. Step 5: Solve for x
    x = 410,099.70/864.16
  6. Step 6: Final answer
    x = 474.56

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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.