Home / 21,422.76-31,923.84-20,718

Finding the Fourth Proportional to 21,422.76, 31,923.84 and 20,718

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Solution

The fourth proportional to 21,422.76, 31,923.84 and 20,718 is: 30,873.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,422.76 : 31,923.84 = 20,718 : x
  2. Step 2: Convert to fraction form
    21,422.76/31,923.84 = 20,718/x
  3. Step 3: Cross multiply
    21,422.76x = 31,923.84 × 20,718
  4. Step 4: Simplify right side
    21,422.76x = 661,398,117.12
  5. Step 5: Solve for x
    x = 661,398,117.12/21,422.76
  6. Step 6: Final answer
    x = 30,873.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.