Home / 1,122.85-1,550.20-998.15

Finding the Fourth Proportional to 1,122.85, 1,550.20 and 998.15

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Solution

The fourth proportional to 1,122.85, 1,550.20 and 998.15 is: 1,378.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.85 : 1,550.20 = 998.15 : x
  2. Step 2: Convert to fraction form
    1,122.85/1,550.20 = 998.15/x
  3. Step 3: Cross multiply
    1,122.85x = 1,550.20 × 998.15
  4. Step 4: Simplify right side
    1,122.85x = 1,547,332.13
  5. Step 5: Solve for x
    x = 1,547,332.13/1,122.85
  6. Step 6: Final answer
    x = 1,378.04

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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.