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Finding the Fourth Proportional to 760.72, 1,049.92 and 636.20

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Solution

The fourth proportional to 760.72, 1,049.92 and 636.20 is: 878.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.72 : 1,049.92 = 636.20 : x
  2. Step 2: Convert to fraction form
    760.72/1,049.92 = 636.20/x
  3. Step 3: Cross multiply
    760.72x = 1,049.92 × 636.20
  4. Step 4: Simplify right side
    760.72x = 667,959.10
  5. Step 5: Solve for x
    x = 667,959.10/760.72
  6. Step 6: Final answer
    x = 878.06

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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.