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Finding the Fourth Proportional to 1,355.37, 2,031.97 and 861.27

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Solution

The fourth proportional to 1,355.37, 2,031.97 and 861.27 is: 1,291.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.37 : 2,031.97 = 861.27 : x
  2. Step 2: Convert to fraction form
    1,355.37/2,031.97 = 861.27/x
  3. Step 3: Cross multiply
    1,355.37x = 2,031.97 × 861.27
  4. Step 4: Simplify right side
    1,355.37x = 1,750,074.80
  5. Step 5: Solve for x
    x = 1,750,074.80/1,355.37
  6. Step 6: Final answer
    x = 1,291.22

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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.