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Finding the Fourth Proportional to 861.98, 1,292.76 and 314.55

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Solution

The fourth proportional to 861.98, 1,292.76 and 314.55 is: 471.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.98 : 1,292.76 = 314.55 : x
  2. Step 2: Convert to fraction form
    861.98/1,292.76 = 314.55/x
  3. Step 3: Cross multiply
    861.98x = 1,292.76 × 314.55
  4. Step 4: Simplify right side
    861.98x = 406,637.66
  5. Step 5: Solve for x
    x = 406,637.66/861.98
  6. Step 6: Final answer
    x = 471.75

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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.