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Finding the Fourth Proportional to 1,141.81, 1,715.45 and 731.75

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Solution

The fourth proportional to 1,141.81, 1,715.45 and 731.75 is: 1,099.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.81 : 1,715.45 = 731.75 : x
  2. Step 2: Convert to fraction form
    1,141.81/1,715.45 = 731.75/x
  3. Step 3: Cross multiply
    1,141.81x = 1,715.45 × 731.75
  4. Step 4: Simplify right side
    1,141.81x = 1,255,280.54
  5. Step 5: Solve for x
    x = 1,255,280.54/1,141.81
  6. Step 6: Final answer
    x = 1,099.38

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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.