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Finding the Fourth Proportional to 2,275.72, 3,140.58 and 1,391.92

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Solution

The fourth proportional to 2,275.72, 3,140.58 and 1,391.92 is: 1,920.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,275.72 : 3,140.58 = 1,391.92 : x
  2. Step 2: Convert to fraction form
    2,275.72/3,140.58 = 1,391.92/x
  3. Step 3: Cross multiply
    2,275.72x = 3,140.58 × 1,391.92
  4. Step 4: Simplify right side
    2,275.72x = 4,371,436.11
  5. Step 5: Solve for x
    x = 4,371,436.11/2,275.72
  6. Step 6: Final answer
    x = 1,920.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.