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Finding the Fourth Proportional to 1,432.32, 1,976.80 and 872.80

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Solution

The fourth proportional to 1,432.32, 1,976.80 and 872.80 is: 1,204.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,432.32 : 1,976.80 = 872.80 : x
  2. Step 2: Convert to fraction form
    1,432.32/1,976.80 = 872.80/x
  3. Step 3: Cross multiply
    1,432.32x = 1,976.80 × 872.80
  4. Step 4: Simplify right side
    1,432.32x = 1,725,351.04
  5. Step 5: Solve for x
    x = 1,725,351.04/1,432.32
  6. Step 6: Final answer
    x = 1,204.58

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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.