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Finding the Fourth Proportional to 862.65, 1,293.84 and 314.55

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Solution

The fourth proportional to 862.65, 1,293.84 and 314.55 is: 471.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.65 : 1,293.84 = 314.55 : x
  2. Step 2: Convert to fraction form
    862.65/1,293.84 = 314.55/x
  3. Step 3: Cross multiply
    862.65x = 1,293.84 × 314.55
  4. Step 4: Simplify right side
    862.65x = 406,977.37
  5. Step 5: Solve for x
    x = 406,977.37/862.65
  6. Step 6: Final answer
    x = 471.78

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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.