Home / 21,868.80-32,811.30-7,078.20

Finding the Fourth Proportional to 21,868.80, 32,811.30 and 7,078.20

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Solution

The fourth proportional to 21,868.80, 32,811.30 and 7,078.20 is: 10,619.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,868.80 : 32,811.30 = 7,078.20 : x
  2. Step 2: Convert to fraction form
    21,868.80/32,811.30 = 7,078.20/x
  3. Step 3: Cross multiply
    21,868.80x = 32,811.30 × 7,078.20
  4. Step 4: Simplify right side
    21,868.80x = 232,244,943.66
  5. Step 5: Solve for x
    x = 232,244,943.66/21,868.80
  6. Step 6: Final answer
    x = 10,619.92

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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.