Home / 21,212.84-31,660.53-20,862.55

Finding the Fourth Proportional to 21,212.84, 31,660.53 and 20,862.55

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Solution

The fourth proportional to 21,212.84, 31,660.53 and 20,862.55 is: 31,137.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,212.84 : 31,660.53 = 20,862.55 : x
  2. Step 2: Convert to fraction form
    21,212.84/31,660.53 = 20,862.55/x
  3. Step 3: Cross multiply
    21,212.84x = 31,660.53 × 20,862.55
  4. Step 4: Simplify right side
    21,212.84x = 660,519,232.08
  5. Step 5: Solve for x
    x = 660,519,232.08/21,212.84
  6. Step 6: Final answer
    x = 31,137.71

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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.