Home / 21,186.14-31,772.24-7,142.38

Finding the Fourth Proportional to 21,186.14, 31,772.24 and 7,142.38

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Solution

The fourth proportional to 21,186.14, 31,772.24 and 7,142.38 is: 10,711.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,186.14 : 31,772.24 = 7,142.38 : x
  2. Step 2: Convert to fraction form
    21,186.14/31,772.24 = 7,142.38/x
  3. Step 3: Cross multiply
    21,186.14x = 31,772.24 × 7,142.38
  4. Step 4: Simplify right side
    21,186.14x = 226,929,216.96
  5. Step 5: Solve for x
    x = 226,929,216.96/21,186.14
  6. Step 6: Final answer
    x = 10,711.21

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1.5x scale

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.