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Finding the Fourth Proportional to 3,908.57, 5,862.65 and 986.90

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Solution

The fourth proportional to 3,908.57, 5,862.65 and 986.90 is: 1,480.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,908.57 : 5,862.65 = 986.90 : x
  2. Step 2: Convert to fraction form
    3,908.57/5,862.65 = 986.90/x
  3. Step 3: Cross multiply
    3,908.57x = 5,862.65 × 986.90
  4. Step 4: Simplify right side
    3,908.57x = 5,785,815.04
  5. Step 5: Solve for x
    x = 5,785,815.04/3,908.57
  6. Step 6: Final answer
    x = 1,480.29

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1.5x scale

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.