Home / 1,289.28-1,778.51-1,112.97

Finding the Fourth Proportional to 1,289.28, 1,778.51 and 1,112.97

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Solution

The fourth proportional to 1,289.28, 1,778.51 and 1,112.97 is: 1,535.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.28 : 1,778.51 = 1,112.97 : x
  2. Step 2: Convert to fraction form
    1,289.28/1,778.51 = 1,112.97/x
  3. Step 3: Cross multiply
    1,289.28x = 1,778.51 × 1,112.97
  4. Step 4: Simplify right side
    1,289.28x = 1,979,422.71
  5. Step 5: Solve for x
    x = 1,979,422.71/1,289.28
  6. Step 6: Final answer
    x = 1,535.29

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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.