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Finding the Fourth Proportional to 2,659.39, 3,988.78 and 711.74

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Solution

The fourth proportional to 2,659.39, 3,988.78 and 711.74 is: 1,067.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,659.39 : 3,988.78 = 711.74 : x
  2. Step 2: Convert to fraction form
    2,659.39/3,988.78 = 711.74/x
  3. Step 3: Cross multiply
    2,659.39x = 3,988.78 × 711.74
  4. Step 4: Simplify right side
    2,659.39x = 2,838,974.28
  5. Step 5: Solve for x
    x = 2,838,974.28/2,659.39
  6. Step 6: Final answer
    x = 1,067.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.