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Finding the Fourth Proportional to 7,091.30, 9,785.73 and 3,947.42

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Solution

The fourth proportional to 7,091.30, 9,785.73 and 3,947.42 is: 5,447.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,091.30 : 9,785.73 = 3,947.42 : x
  2. Step 2: Convert to fraction form
    7,091.30/9,785.73 = 3,947.42/x
  3. Step 3: Cross multiply
    7,091.30x = 9,785.73 × 3,947.42
  4. Step 4: Simplify right side
    7,091.30x = 38,628,386.32
  5. Step 5: Solve for x
    x = 38,628,386.32/7,091.30
  6. Step 6: Final answer
    x = 5,447.29

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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.