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Finding the Fourth Proportional to 1,139.28, 1,711.12 and 1,094.40

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Solution

The fourth proportional to 1,139.28, 1,711.12 and 1,094.40 is: 1,643.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.28 : 1,711.12 = 1,094.40 : x
  2. Step 2: Convert to fraction form
    1,139.28/1,711.12 = 1,094.40/x
  3. Step 3: Cross multiply
    1,139.28x = 1,711.12 × 1,094.40
  4. Step 4: Simplify right side
    1,139.28x = 1,872,649.73
  5. Step 5: Solve for x
    x = 1,872,649.73/1,139.28
  6. Step 6: Final answer
    x = 1,643.71

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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.