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Finding the Fourth Proportional to 7,179.40, 9,908.13 and 3,992.86

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Solution

The fourth proportional to 7,179.40, 9,908.13 and 3,992.86 is: 5,510.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,179.40 : 9,908.13 = 3,992.86 : x
  2. Step 2: Convert to fraction form
    7,179.40/9,908.13 = 3,992.86/x
  3. Step 3: Cross multiply
    7,179.40x = 9,908.13 × 3,992.86
  4. Step 4: Simplify right side
    7,179.40x = 39,561,775.95
  5. Step 5: Solve for x
    x = 39,561,775.95/7,179.40
  6. Step 6: Final answer
    x = 5,510.46

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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.