Home / 21,451.84-31,987.56-20,021.92

Finding the Fourth Proportional to 21,451.84, 31,987.56 and 20,021.92

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Solution

The fourth proportional to 21,451.84, 31,987.56 and 20,021.92 is: 29,855.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,451.84 : 31,987.56 = 20,021.92 : x
  2. Step 2: Convert to fraction form
    21,451.84/31,987.56 = 20,021.92/x
  3. Step 3: Cross multiply
    21,451.84x = 31,987.56 × 20,021.92
  4. Step 4: Simplify right side
    21,451.84x = 640,452,367.32
  5. Step 5: Solve for x
    x = 640,452,367.32/21,451.84
  6. Step 6: Final answer
    x = 29,855.36

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1.5x scale

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.