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Finding the Fourth Proportional to 2,171.12, 3,256.68 and 871.68

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Solution

The fourth proportional to 2,171.12, 3,256.68 and 871.68 is: 1,307.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,171.12 : 3,256.68 = 871.68 : x
  2. Step 2: Convert to fraction form
    2,171.12/3,256.68 = 871.68/x
  3. Step 3: Cross multiply
    2,171.12x = 3,256.68 × 871.68
  4. Step 4: Simplify right side
    2,171.12x = 2,838,782.82
  5. Step 5: Solve for x
    x = 2,838,782.82/2,171.12
  6. Step 6: Final answer
    x = 1,307.52

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Similar ratio
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1.5x scale

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.