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Finding the Fourth Proportional to 861.24, 1,290.96 and 587.37

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Solution

The fourth proportional to 861.24, 1,290.96 and 587.37 is: 880.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.24 : 1,290.96 = 587.37 : x
  2. Step 2: Convert to fraction form
    861.24/1,290.96 = 587.37/x
  3. Step 3: Cross multiply
    861.24x = 1,290.96 × 587.37
  4. Step 4: Simplify right side
    861.24x = 758,271.18
  5. Step 5: Solve for x
    x = 758,271.18/861.24
  6. Step 6: Final answer
    x = 880.44

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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.