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Finding the Fourth Proportional to 2,113.90, 3,171.76 and 815.07

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Solution

The fourth proportional to 2,113.90, 3,171.76 and 815.07 is: 1,222.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,113.90 : 3,171.76 = 815.07 : x
  2. Step 2: Convert to fraction form
    2,113.90/3,171.76 = 815.07/x
  3. Step 3: Cross multiply
    2,113.90x = 3,171.76 × 815.07
  4. Step 4: Simplify right side
    2,113.90x = 2,585,206.42
  5. Step 5: Solve for x
    x = 2,585,206.42/2,113.90
  6. Step 6: Final answer
    x = 1,222.96

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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.