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Finding the Fourth Proportional to 861.84, 1,291.85 and 422.48

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Solution

The fourth proportional to 861.84, 1,291.85 and 422.48 is: 633.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.84 : 1,291.85 = 422.48 : x
  2. Step 2: Convert to fraction form
    861.84/1,291.85 = 422.48/x
  3. Step 3: Cross multiply
    861.84x = 1,291.85 × 422.48
  4. Step 4: Simplify right side
    861.84x = 545,780.79
  5. Step 5: Solve for x
    x = 545,780.79/861.84
  6. Step 6: Final answer
    x = 633.27

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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.