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Finding the Fourth Proportional to 2,691.15, 4,036.70 and 842.28

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Solution

The fourth proportional to 2,691.15, 4,036.70 and 842.28 is: 1,263.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,691.15 : 4,036.70 = 842.28 : x
  2. Step 2: Convert to fraction form
    2,691.15/4,036.70 = 842.28/x
  3. Step 3: Cross multiply
    2,691.15x = 4,036.70 × 842.28
  4. Step 4: Simplify right side
    2,691.15x = 3,400,031.68
  5. Step 5: Solve for x
    x = 3,400,031.68/2,691.15
  6. Step 6: Final answer
    x = 1,263.41

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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.