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Finding the Fourth Proportional to 2,113.73, 3,171.05 and 815.20

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Solution

The fourth proportional to 2,113.73, 3,171.05 and 815.20 is: 1,222.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,113.73 : 3,171.05 = 815.20 : x
  2. Step 2: Convert to fraction form
    2,113.73/3,171.05 = 815.20/x
  3. Step 3: Cross multiply
    2,113.73x = 3,171.05 × 815.20
  4. Step 4: Simplify right side
    2,113.73x = 2,585,039.96
  5. Step 5: Solve for x
    x = 2,585,039.96/2,113.73
  6. Step 6: Final answer
    x = 1,222.98

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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.