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Finding the Fourth Proportional to 861.28, 1,291.01 and 586.69

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Solution

The fourth proportional to 861.28, 1,291.01 and 586.69 is: 879.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.28 : 1,291.01 = 586.69 : x
  2. Step 2: Convert to fraction form
    861.28/1,291.01 = 586.69/x
  3. Step 3: Cross multiply
    861.28x = 1,291.01 × 586.69
  4. Step 4: Simplify right side
    861.28x = 757,416.50
  5. Step 5: Solve for x
    x = 757,416.50/861.28
  6. Step 6: Final answer
    x = 879.41

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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.