Home / 21,213.84-31,662.02-20,863.55

Finding the Fourth Proportional to 21,213.84, 31,662.02 and 20,863.55

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Solution

The fourth proportional to 21,213.84, 31,662.02 and 20,863.55 is: 31,139.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,213.84 : 31,662.02 = 20,863.55 : x
  2. Step 2: Convert to fraction form
    21,213.84/31,662.02 = 20,863.55/x
  3. Step 3: Cross multiply
    21,213.84x = 31,662.02 × 20,863.55
  4. Step 4: Simplify right side
    21,213.84x = 660,582,137.37
  5. Step 5: Solve for x
    x = 660,582,137.37/21,213.84
  6. Step 6: Final answer
    x = 31,139.21

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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.