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Finding the Fourth Proportional to 6,979.52, 9,628.93 and 3,993.76

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Solution

The fourth proportional to 6,979.52, 9,628.93 and 3,993.76 is: 5,509.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,979.52 : 9,628.93 = 3,993.76 : x
  2. Step 2: Convert to fraction form
    6,979.52/9,628.93 = 3,993.76/x
  3. Step 3: Cross multiply
    6,979.52x = 9,628.93 × 3,993.76
  4. Step 4: Simplify right side
    6,979.52x = 38,455,575.88
  5. Step 5: Solve for x
    x = 38,455,575.88/6,979.52
  6. Step 6: Final answer
    x = 5,509.78

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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.