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Finding the Fourth Proportional to 3,908.79, 5,862.64 and 986.91

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Solution

The fourth proportional to 3,908.79, 5,862.64 and 986.91 is: 1,480.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,908.79 : 5,862.64 = 986.91 : x
  2. Step 2: Convert to fraction form
    3,908.79/5,862.64 = 986.91/x
  3. Step 3: Cross multiply
    3,908.79x = 5,862.64 × 986.91
  4. Step 4: Simplify right side
    3,908.79x = 5,785,898.04
  5. Step 5: Solve for x
    x = 5,785,898.04/3,908.79
  6. Step 6: Final answer
    x = 1,480.23

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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.