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Finding the Fourth Proportional to 861.52, 1,292.48 and 313.68

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Solution

The fourth proportional to 861.52, 1,292.48 and 313.68 is: 470.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.52 : 1,292.48 = 313.68 : x
  2. Step 2: Convert to fraction form
    861.52/1,292.48 = 313.68/x
  3. Step 3: Cross multiply
    861.52x = 1,292.48 × 313.68
  4. Step 4: Simplify right side
    861.52x = 405,425.13
  5. Step 5: Solve for x
    x = 405,425.13/861.52
  6. Step 6: Final answer
    x = 470.59

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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.