Home / 3,985.40-5,977.28-3,787.80

Finding the Fourth Proportional to 3,985.40, 5,977.28 and 3,787.80

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Solution

The fourth proportional to 3,985.40, 5,977.28 and 3,787.80 is: 5,680.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,985.40 : 5,977.28 = 3,787.80 : x
  2. Step 2: Convert to fraction form
    3,985.40/5,977.28 = 3,787.80/x
  3. Step 3: Cross multiply
    3,985.40x = 5,977.28 × 3,787.80
  4. Step 4: Simplify right side
    3,985.40x = 22,640,722.25
  5. Step 5: Solve for x
    x = 22,640,722.25/3,985.40
  6. Step 6: Final answer
    x = 5,680.92

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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.