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Finding the Fourth Proportional to 1,151.28, 1,724.48 and 803.79

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Solution

The fourth proportional to 1,151.28, 1,724.48 and 803.79 is: 1,203.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.28 : 1,724.48 = 803.79 : x
  2. Step 2: Convert to fraction form
    1,151.28/1,724.48 = 803.79/x
  3. Step 3: Cross multiply
    1,151.28x = 1,724.48 × 803.79
  4. Step 4: Simplify right side
    1,151.28x = 1,386,115.76
  5. Step 5: Solve for x
    x = 1,386,115.76/1,151.28
  6. Step 6: Final answer
    x = 1,203.98

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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.