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Finding the Fourth Proportional to 861.91, 1,292.08 and 313.97

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Solution

The fourth proportional to 861.91, 1,292.08 and 313.97 is: 470.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.91 : 1,292.08 = 313.97 : x
  2. Step 2: Convert to fraction form
    861.91/1,292.08 = 313.97/x
  3. Step 3: Cross multiply
    861.91x = 1,292.08 × 313.97
  4. Step 4: Simplify right side
    861.91x = 405,667.11
  5. Step 5: Solve for x
    x = 405,667.11/861.91
  6. Step 6: Final answer
    x = 470.66

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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.