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Finding the Fourth Proportional to 7,189.09, 9,921.15 and 3,959.01

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Solution

The fourth proportional to 7,189.09, 9,921.15 and 3,959.01 is: 5,463.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,189.09 : 9,921.15 = 3,959.01 : x
  2. Step 2: Convert to fraction form
    7,189.09/9,921.15 = 3,959.01/x
  3. Step 3: Cross multiply
    7,189.09x = 9,921.15 × 3,959.01
  4. Step 4: Simplify right side
    7,189.09x = 39,277,932.06
  5. Step 5: Solve for x
    x = 39,277,932.06/7,189.09
  6. Step 6: Final answer
    x = 5,463.55

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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.