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Finding the Fourth Proportional to 862.65, 1,292.96 and 314.48

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Solution

The fourth proportional to 862.65, 1,292.96 and 314.48 is: 471.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.65 : 1,292.96 = 314.48 : x
  2. Step 2: Convert to fraction form
    862.65/1,292.96 = 314.48/x
  3. Step 3: Cross multiply
    862.65x = 1,292.96 × 314.48
  4. Step 4: Simplify right side
    862.65x = 406,614.08
  5. Step 5: Solve for x
    x = 406,614.08/862.65
  6. Step 6: Final answer
    x = 471.35

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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.