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Finding the Fourth Proportional to 1,141.76, 1,711.56 and 411.14

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Solution

The fourth proportional to 1,141.76, 1,711.56 and 411.14 is: 616.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.76 : 1,711.56 = 411.14 : x
  2. Step 2: Convert to fraction form
    1,141.76/1,711.56 = 411.14/x
  3. Step 3: Cross multiply
    1,141.76x = 1,711.56 × 411.14
  4. Step 4: Simplify right side
    1,141.76x = 703,690.78
  5. Step 5: Solve for x
    x = 703,690.78/1,141.76
  6. Step 6: Final answer
    x = 616.32

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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.