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Finding the Fourth Proportional to 7,043.96, 9,720.78 and 3,900.32

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Solution

The fourth proportional to 7,043.96, 9,720.78 and 3,900.32 is: 5,382.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,043.96 : 9,720.78 = 3,900.32 : x
  2. Step 2: Convert to fraction form
    7,043.96/9,720.78 = 3,900.32/x
  3. Step 3: Cross multiply
    7,043.96x = 9,720.78 × 3,900.32
  4. Step 4: Simplify right side
    7,043.96x = 37,914,152.65
  5. Step 5: Solve for x
    x = 37,914,152.65/7,043.96
  6. Step 6: Final answer
    x = 5,382.51

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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.