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Finding the Fourth Proportional to 2,591.78, 3,887.68 and 860

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Solution

The fourth proportional to 2,591.78, 3,887.68 and 860 is: 1,290.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,591.78 : 3,887.68 = 860 : x
  2. Step 2: Convert to fraction form
    2,591.78/3,887.68 = 860/x
  3. Step 3: Cross multiply
    2,591.78x = 3,887.68 × 860
  4. Step 4: Simplify right side
    2,591.78x = 3,343,404.80
  5. Step 5: Solve for x
    x = 3,343,404.80/2,591.78
  6. Step 6: Final answer
    x = 1,290.00

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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.