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Finding the Fourth Proportional to 1,708.78, 2,563.88 and 721.84

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Solution

The fourth proportional to 1,708.78, 2,563.88 and 721.84 is: 1,083.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,708.78 : 2,563.88 = 721.84 : x
  2. Step 2: Convert to fraction form
    1,708.78/2,563.88 = 721.84/x
  3. Step 3: Cross multiply
    1,708.78x = 2,563.88 × 721.84
  4. Step 4: Simplify right side
    1,708.78x = 1,850,711.14
  5. Step 5: Solve for x
    x = 1,850,711.14/1,708.78
  6. Step 6: Final answer
    x = 1,083.06

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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.