Home / 1,121.43-1,544.36-1,117.78

Finding the Fourth Proportional to 1,121.43, 1,544.36 and 1,117.78

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Solution

The fourth proportional to 1,121.43, 1,544.36 and 1,117.78 is: 1,539.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.43 : 1,544.36 = 1,117.78 : x
  2. Step 2: Convert to fraction form
    1,121.43/1,544.36 = 1,117.78/x
  3. Step 3: Cross multiply
    1,121.43x = 1,544.36 × 1,117.78
  4. Step 4: Simplify right side
    1,121.43x = 1,726,254.72
  5. Step 5: Solve for x
    x = 1,726,254.72/1,121.43
  6. Step 6: Final answer
    x = 1,539.33

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1.5x scale

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.