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Finding the Fourth Proportional to 2,129.67, 3,194.55 and 830.88

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Solution

The fourth proportional to 2,129.67, 3,194.55 and 830.88 is: 1,246.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.67 : 3,194.55 = 830.88 : x
  2. Step 2: Convert to fraction form
    2,129.67/3,194.55 = 830.88/x
  3. Step 3: Cross multiply
    2,129.67x = 3,194.55 × 830.88
  4. Step 4: Simplify right side
    2,129.67x = 2,654,287.70
  5. Step 5: Solve for x
    x = 2,654,287.70/2,129.67
  6. Step 6: Final answer
    x = 1,246.34

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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.