Home / 21,007.20-28,989.18-11,575.80

Finding the Fourth Proportional to 21,007.20, 28,989.18 and 11,575.80

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Solution

The fourth proportional to 21,007.20, 28,989.18 and 11,575.80 is: 15,974.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.20 : 28,989.18 = 11,575.80 : x
  2. Step 2: Convert to fraction form
    21,007.20/28,989.18 = 11,575.80/x
  3. Step 3: Cross multiply
    21,007.20x = 28,989.18 × 11,575.80
  4. Step 4: Simplify right side
    21,007.20x = 335,572,949.84
  5. Step 5: Solve for x
    x = 335,572,949.84/21,007.20
  6. Step 6: Final answer
    x = 15,974.19

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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.