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Finding the Fourth Proportional to 3,977.79, 5,978.66 and 3,288.87

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Solution

The fourth proportional to 3,977.79, 5,978.66 and 3,288.87 is: 4,943.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,977.79 : 5,978.66 = 3,288.87 : x
  2. Step 2: Convert to fraction form
    3,977.79/5,978.66 = 3,288.87/x
  3. Step 3: Cross multiply
    3,977.79x = 5,978.66 × 3,288.87
  4. Step 4: Simplify right side
    3,977.79x = 19,663,019.07
  5. Step 5: Solve for x
    x = 19,663,019.07/3,977.79
  6. Step 6: Final answer
    x = 4,943.20

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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.