Home / 1,425.20-1,974.38-1,391.18

Finding the Fourth Proportional to 1,425.20, 1,974.38 and 1,391.18

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Solution

The fourth proportional to 1,425.20, 1,974.38 and 1,391.18 is: 1,927.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.20 : 1,974.38 = 1,391.18 : x
  2. Step 2: Convert to fraction form
    1,425.20/1,974.38 = 1,391.18/x
  3. Step 3: Cross multiply
    1,425.20x = 1,974.38 × 1,391.18
  4. Step 4: Simplify right side
    1,425.20x = 2,746,701.14
  5. Step 5: Solve for x
    x = 2,746,701.14/1,425.20
  6. Step 6: Final answer
    x = 1,927.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.