Home / 2,113.62-3,170.85-815.10

Finding the Fourth Proportional to 2,113.62, 3,170.85 and 815.10

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Solution

The fourth proportional to 2,113.62, 3,170.85 and 815.10 is: 1,222.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,113.62 : 3,170.85 = 815.10 : x
  2. Step 2: Convert to fraction form
    2,113.62/3,170.85 = 815.10/x
  3. Step 3: Cross multiply
    2,113.62x = 3,170.85 × 815.10
  4. Step 4: Simplify right side
    2,113.62x = 2,584,559.84
  5. Step 5: Solve for x
    x = 2,584,559.84/2,113.62
  6. Step 6: Final answer
    x = 1,222.81

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Double scale
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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.