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Finding the Fourth Proportional to 2,275.43, 3,411.92 and 813.78

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Solution

The fourth proportional to 2,275.43, 3,411.92 and 813.78 is: 1,220.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,275.43 : 3,411.92 = 813.78 : x
  2. Step 2: Convert to fraction form
    2,275.43/3,411.92 = 813.78/x
  3. Step 3: Cross multiply
    2,275.43x = 3,411.92 × 813.78
  4. Step 4: Simplify right side
    2,275.43x = 2,776,554.29
  5. Step 5: Solve for x
    x = 2,776,554.29/2,275.43
  6. Step 6: Final answer
    x = 1,220.24

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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.