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Finding the Fourth Proportional to 861.47, 1,292.20 and 341.75

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Solution

The fourth proportional to 861.47, 1,292.20 and 341.75 is: 512.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.47 : 1,292.20 = 341.75 : x
  2. Step 2: Convert to fraction form
    861.47/1,292.20 = 341.75/x
  3. Step 3: Cross multiply
    861.47x = 1,292.20 × 341.75
  4. Step 4: Simplify right side
    861.47x = 441,613.65
  5. Step 5: Solve for x
    x = 441,613.65/861.47
  6. Step 6: Final answer
    x = 512.63

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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.