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Finding the Fourth Proportional to 861.82, 1,290.42 and 588.44

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Solution

The fourth proportional to 861.82, 1,290.42 and 588.44 is: 881.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.82 : 1,290.42 = 588.44 : x
  2. Step 2: Convert to fraction form
    861.82/1,290.42 = 588.44/x
  3. Step 3: Cross multiply
    861.82x = 1,290.42 × 588.44
  4. Step 4: Simplify right side
    861.82x = 759,334.74
  5. Step 5: Solve for x
    x = 759,334.74/861.82
  6. Step 6: Final answer
    x = 881.08

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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.