Home / 1,221.56-1,687.12-1,090.36

Finding the Fourth Proportional to 1,221.56, 1,687.12 and 1,090.36

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Solution

The fourth proportional to 1,221.56, 1,687.12 and 1,090.36 is: 1,505.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.56 : 1,687.12 = 1,090.36 : x
  2. Step 2: Convert to fraction form
    1,221.56/1,687.12 = 1,090.36/x
  3. Step 3: Cross multiply
    1,221.56x = 1,687.12 × 1,090.36
  4. Step 4: Simplify right side
    1,221.56x = 1,839,568.16
  5. Step 5: Solve for x
    x = 1,839,568.16/1,221.56
  6. Step 6: Final answer
    x = 1,505.92

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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.