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Finding the Fourth Proportional to 7,057.13, 9,739.01 and 3,990.72

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Solution

The fourth proportional to 7,057.13, 9,739.01 and 3,990.72 is: 5,507.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,057.13 : 9,739.01 = 3,990.72 : x
  2. Step 2: Convert to fraction form
    7,057.13/9,739.01 = 3,990.72/x
  3. Step 3: Cross multiply
    7,057.13x = 9,739.01 × 3,990.72
  4. Step 4: Simplify right side
    7,057.13x = 38,865,642.03
  5. Step 5: Solve for x
    x = 38,865,642.03/7,057.13
  6. Step 6: Final answer
    x = 5,507.29

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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.