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Finding the Fourth Proportional to 1,385.87, 2,079.29 and 865.26

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Solution

The fourth proportional to 1,385.87, 2,079.29 and 865.26 is: 1,298.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.87 : 2,079.29 = 865.26 : x
  2. Step 2: Convert to fraction form
    1,385.87/2,079.29 = 865.26/x
  3. Step 3: Cross multiply
    1,385.87x = 2,079.29 × 865.26
  4. Step 4: Simplify right side
    1,385.87x = 1,799,131.12
  5. Step 5: Solve for x
    x = 1,799,131.12/1,385.87
  6. Step 6: Final answer
    x = 1,298.20

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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.