Home / 2,386.78-3,293.84-1,391.90

Finding the Fourth Proportional to 2,386.78, 3,293.84 and 1,391.90

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Solution

The fourth proportional to 2,386.78, 3,293.84 and 1,391.90 is: 1,920.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,386.78 : 3,293.84 = 1,391.90 : x
  2. Step 2: Convert to fraction form
    2,386.78/3,293.84 = 1,391.90/x
  3. Step 3: Cross multiply
    2,386.78x = 3,293.84 × 1,391.90
  4. Step 4: Simplify right side
    2,386.78x = 4,584,695.90
  5. Step 5: Solve for x
    x = 4,584,695.90/2,386.78
  6. Step 6: Final answer
    x = 1,920.87

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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.