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Finding the Fourth Proportional to 851.92, 1,275.32 and 721.36

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Solution

The fourth proportional to 851.92, 1,275.32 and 721.36 is: 1,079.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.92 : 1,275.32 = 721.36 : x
  2. Step 2: Convert to fraction form
    851.92/1,275.32 = 721.36/x
  3. Step 3: Cross multiply
    851.92x = 1,275.32 × 721.36
  4. Step 4: Simplify right side
    851.92x = 919,964.84
  5. Step 5: Solve for x
    x = 919,964.84/851.92
  6. Step 6: Final answer
    x = 1,079.87

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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.