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Finding the Fourth Proportional to 3,988.95, 5,964.43 and 3,640.40

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Solution

The fourth proportional to 3,988.95, 5,964.43 and 3,640.40 is: 5,443.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.95 : 5,964.43 = 3,640.40 : x
  2. Step 2: Convert to fraction form
    3,988.95/5,964.43 = 3,640.40/x
  3. Step 3: Cross multiply
    3,988.95x = 5,964.43 × 3,640.40
  4. Step 4: Simplify right side
    3,988.95x = 21,712,910.97
  5. Step 5: Solve for x
    x = 21,712,910.97/3,988.95
  6. Step 6: Final answer
    x = 5,443.26

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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.