Home / 1,138.20-1,569.93-1,100.12

Finding the Fourth Proportional to 1,138.20, 1,569.93 and 1,100.12

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Solution

The fourth proportional to 1,138.20, 1,569.93 and 1,100.12 is: 1,517.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.20 : 1,569.93 = 1,100.12 : x
  2. Step 2: Convert to fraction form
    1,138.20/1,569.93 = 1,100.12/x
  3. Step 3: Cross multiply
    1,138.20x = 1,569.93 × 1,100.12
  4. Step 4: Simplify right side
    1,138.20x = 1,727,103.54
  5. Step 5: Solve for x
    x = 1,727,103.54/1,138.20
  6. Step 6: Final answer
    x = 1,517.40

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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.