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Finding the Fourth Proportional to 2,171.64, 3,257.46 and 710.78

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Solution

The fourth proportional to 2,171.64, 3,257.46 and 710.78 is: 1,066.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,171.64 : 3,257.46 = 710.78 : x
  2. Step 2: Convert to fraction form
    2,171.64/3,257.46 = 710.78/x
  3. Step 3: Cross multiply
    2,171.64x = 3,257.46 × 710.78
  4. Step 4: Simplify right side
    2,171.64x = 2,315,321.13
  5. Step 5: Solve for x
    x = 2,315,321.13/2,171.64
  6. Step 6: Final answer
    x = 1,066.16

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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.