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Finding the Fourth Proportional to 7,112.79, 9,815.92 and 3,969.59

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Solution

The fourth proportional to 7,112.79, 9,815.92 and 3,969.59 is: 5,478.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,112.79 : 9,815.92 = 3,969.59 : x
  2. Step 2: Convert to fraction form
    7,112.79/9,815.92 = 3,969.59/x
  3. Step 3: Cross multiply
    7,112.79x = 9,815.92 × 3,969.59
  4. Step 4: Simplify right side
    7,112.79x = 38,965,118.87
  5. Step 5: Solve for x
    x = 38,965,118.87/7,112.79
  6. Step 6: Final answer
    x = 5,478.18

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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.