Home / 20,822.80-31,242.30-9,127.78

Finding the Fourth Proportional to 20,822.80, 31,242.30 and 9,127.78

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Solution

The fourth proportional to 20,822.80, 31,242.30 and 9,127.78 is: 13,695.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,822.80 : 31,242.30 = 9,127.78 : x
  2. Step 2: Convert to fraction form
    20,822.80/31,242.30 = 9,127.78/x
  3. Step 3: Cross multiply
    20,822.80x = 31,242.30 × 9,127.78
  4. Step 4: Simplify right side
    20,822.80x = 285,172,841.09
  5. Step 5: Solve for x
    x = 285,172,841.09/20,822.80
  6. Step 6: Final answer
    x = 13,695.22

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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.