Home / 1,221.20-1,821.02-1,186.44

Finding the Fourth Proportional to 1,221.20, 1,821.02 and 1,186.44

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Solution

The fourth proportional to 1,221.20, 1,821.02 and 1,186.44 is: 1,769.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.20 : 1,821.02 = 1,186.44 : x
  2. Step 2: Convert to fraction form
    1,221.20/1,821.02 = 1,186.44/x
  3. Step 3: Cross multiply
    1,221.20x = 1,821.02 × 1,186.44
  4. Step 4: Simplify right side
    1,221.20x = 2,160,530.97
  5. Step 5: Solve for x
    x = 2,160,530.97/1,221.20
  6. Step 6: Final answer
    x = 1,769.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.