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Finding the Fourth Proportional to 3,972.65, 5,478.97 and 3,018.72

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Solution

The fourth proportional to 3,972.65, 5,478.97 and 3,018.72 is: 4,163.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,972.65 : 5,478.97 = 3,018.72 : x
  2. Step 2: Convert to fraction form
    3,972.65/5,478.97 = 3,018.72/x
  3. Step 3: Cross multiply
    3,972.65x = 5,478.97 × 3,018.72
  4. Step 4: Simplify right side
    3,972.65x = 16,539,455.67
  5. Step 5: Solve for x
    x = 16,539,455.67/3,972.65
  6. Step 6: Final answer
    x = 4,163.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.