Home / 21,121.86-31,682.79-7,080.78

Finding the Fourth Proportional to 21,121.86, 31,682.79 and 7,080.78

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Solution

The fourth proportional to 21,121.86, 31,682.79 and 7,080.78 is: 10,621.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.86 : 31,682.79 = 7,080.78 : x
  2. Step 2: Convert to fraction form
    21,121.86/31,682.79 = 7,080.78/x
  3. Step 3: Cross multiply
    21,121.86x = 31,682.79 × 7,080.78
  4. Step 4: Simplify right side
    21,121.86x = 224,338,865.78
  5. Step 5: Solve for x
    x = 224,338,865.78/21,121.86
  6. Step 6: Final answer
    x = 10,621.17

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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.