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Finding the Fourth Proportional to 1,376.68, 1,888.17 and 1,221.16

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Solution

The fourth proportional to 1,376.68, 1,888.17 and 1,221.16 is: 1,674.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.68 : 1,888.17 = 1,221.16 : x
  2. Step 2: Convert to fraction form
    1,376.68/1,888.17 = 1,221.16/x
  3. Step 3: Cross multiply
    1,376.68x = 1,888.17 × 1,221.16
  4. Step 4: Simplify right side
    1,376.68x = 2,305,757.68
  5. Step 5: Solve for x
    x = 2,305,757.68/1,376.68
  6. Step 6: Final answer
    x = 1,674.87

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.