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Finding the Fourth Proportional to 1,694.81, 2,540.01 and 653.78

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Solution

The fourth proportional to 1,694.81, 2,540.01 and 653.78 is: 979.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,694.81 : 2,540.01 = 653.78 : x
  2. Step 2: Convert to fraction form
    1,694.81/2,540.01 = 653.78/x
  3. Step 3: Cross multiply
    1,694.81x = 2,540.01 × 653.78
  4. Step 4: Simplify right side
    1,694.81x = 1,660,607.74
  5. Step 5: Solve for x
    x = 1,660,607.74/1,694.81
  6. Step 6: Final answer
    x = 979.82

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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.