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Finding the Fourth Proportional to 1,988.75, 2,744.42 and 1,202.78

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Solution

The fourth proportional to 1,988.75, 2,744.42 and 1,202.78 is: 1,659.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.75 : 2,744.42 = 1,202.78 : x
  2. Step 2: Convert to fraction form
    1,988.75/2,744.42 = 1,202.78/x
  3. Step 3: Cross multiply
    1,988.75x = 2,744.42 × 1,202.78
  4. Step 4: Simplify right side
    1,988.75x = 3,300,934.33
  5. Step 5: Solve for x
    x = 3,300,934.33/1,988.75
  6. Step 6: Final answer
    x = 1,659.80

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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.