Home / 11,921.19-17,870.13-5,679.51

Finding the Fourth Proportional to 11,921.19, 17,870.13 and 5,679.51

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Solution

The fourth proportional to 11,921.19, 17,870.13 and 5,679.51 is: 8,513.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,921.19 : 17,870.13 = 5,679.51 : x
  2. Step 2: Convert to fraction form
    11,921.19/17,870.13 = 5,679.51/x
  3. Step 3: Cross multiply
    11,921.19x = 17,870.13 × 5,679.51
  4. Step 4: Simplify right side
    11,921.19x = 101,493,582.04
  5. Step 5: Solve for x
    x = 101,493,582.04/11,921.19
  6. Step 6: Final answer
    x = 8,513.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.