Home / 21,013.19-28,998.20-11,581.75

Finding the Fourth Proportional to 21,013.19, 28,998.20 and 11,581.75

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Solution

The fourth proportional to 21,013.19, 28,998.20 and 11,581.75 is: 15,982.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,013.19 : 28,998.20 = 11,581.75 : x
  2. Step 2: Convert to fraction form
    21,013.19/28,998.20 = 11,581.75/x
  3. Step 3: Cross multiply
    21,013.19x = 28,998.20 × 11,581.75
  4. Step 4: Simplify right side
    21,013.19x = 335,849,968.05
  5. Step 5: Solve for x
    x = 335,849,968.05/21,013.19
  6. Step 6: Final answer
    x = 15,982.82

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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.