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Finding the Fourth Proportional to 2,170.64, 3,256.48 and 709.80

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Solution

The fourth proportional to 2,170.64, 3,256.48 and 709.80 is: 1,064.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,170.64 : 3,256.48 = 709.80 : x
  2. Step 2: Convert to fraction form
    2,170.64/3,256.48 = 709.80/x
  3. Step 3: Cross multiply
    2,170.64x = 3,256.48 × 709.80
  4. Step 4: Simplify right side
    2,170.64x = 2,311,449.50
  5. Step 5: Solve for x
    x = 2,311,449.50/2,170.64
  6. Step 6: Final answer
    x = 1,064.87

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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.