Home / 1,868.90-2,578.19-1,121.54

Finding the Fourth Proportional to 1,868.90, 2,578.19 and 1,121.54

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Solution

The fourth proportional to 1,868.90, 2,578.19 and 1,121.54 is: 1,547.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,868.90 : 2,578.19 = 1,121.54 : x
  2. Step 2: Convert to fraction form
    1,868.90/2,578.19 = 1,121.54/x
  3. Step 3: Cross multiply
    1,868.90x = 2,578.19 × 1,121.54
  4. Step 4: Simplify right side
    1,868.90x = 2,891,524.71
  5. Step 5: Solve for x
    x = 2,891,524.71/1,868.90
  6. Step 6: Final answer
    x = 1,547.18

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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.