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Finding the Fourth Proportional to 1,489.66, 2,052.39 and 1,249.40

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Solution

The fourth proportional to 1,489.66, 2,052.39 and 1,249.40 is: 1,721.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.66 : 2,052.39 = 1,249.40 : x
  2. Step 2: Convert to fraction form
    1,489.66/2,052.39 = 1,249.40/x
  3. Step 3: Cross multiply
    1,489.66x = 2,052.39 × 1,249.40
  4. Step 4: Simplify right side
    1,489.66x = 2,564,245.80
  5. Step 5: Solve for x
    x = 2,564,245.80/1,489.66
  6. Step 6: Final answer
    x = 1,721.37

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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.