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Finding the Fourth Proportional to 861.94, 1,291.34 and 553.84

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Solution

The fourth proportional to 861.94, 1,291.34 and 553.84 is: 829.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.94 : 1,291.34 = 553.84 : x
  2. Step 2: Convert to fraction form
    861.94/1,291.34 = 553.84/x
  3. Step 3: Cross multiply
    861.94x = 1,291.34 × 553.84
  4. Step 4: Simplify right side
    861.94x = 715,195.75
  5. Step 5: Solve for x
    x = 715,195.75/861.94
  6. Step 6: Final answer
    x = 829.75

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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.