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Finding the Fourth Proportional to 2,171.80, 3,258.30 and 874.18

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Solution

The fourth proportional to 2,171.80, 3,258.30 and 874.18 is: 1,311.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,171.80 : 3,258.30 = 874.18 : x
  2. Step 2: Convert to fraction form
    2,171.80/3,258.30 = 874.18/x
  3. Step 3: Cross multiply
    2,171.80x = 3,258.30 × 874.18
  4. Step 4: Simplify right side
    2,171.80x = 2,848,340.69
  5. Step 5: Solve for x
    x = 2,848,340.69/2,171.80
  6. Step 6: Final answer
    x = 1,311.51

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Double scale
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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.