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Finding the Fourth Proportional to 2,113.80, 3,171.09 and 652.61

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Solution

The fourth proportional to 2,113.80, 3,171.09 and 652.61 is: 979.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,113.80 : 3,171.09 = 652.61 : x
  2. Step 2: Convert to fraction form
    2,113.80/3,171.09 = 652.61/x
  3. Step 3: Cross multiply
    2,113.80x = 3,171.09 × 652.61
  4. Step 4: Simplify right side
    2,113.80x = 2,069,473.97
  5. Step 5: Solve for x
    x = 2,069,473.97/2,113.80
  6. Step 6: Final answer
    x = 979.03

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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.