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Finding the Fourth Proportional to 1,339.20, 1,847.52 and 872.64

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Solution

The fourth proportional to 1,339.20, 1,847.52 and 872.64 is: 1,203.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.20 : 1,847.52 = 872.64 : x
  2. Step 2: Convert to fraction form
    1,339.20/1,847.52 = 872.64/x
  3. Step 3: Cross multiply
    1,339.20x = 1,847.52 × 872.64
  4. Step 4: Simplify right side
    1,339.20x = 1,612,219.85
  5. Step 5: Solve for x
    x = 1,612,219.85/1,339.20
  6. Step 6: Final answer
    x = 1,203.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.