Home / 21,228.54-31,776.21-13,722.10

Finding the Fourth Proportional to 21,228.54, 31,776.21 and 13,722.10

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Solution

The fourth proportional to 21,228.54, 31,776.21 and 13,722.10 is: 20,540.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,228.54 : 31,776.21 = 13,722.10 : x
  2. Step 2: Convert to fraction form
    21,228.54/31,776.21 = 13,722.10/x
  3. Step 3: Cross multiply
    21,228.54x = 31,776.21 × 13,722.10
  4. Step 4: Simplify right side
    21,228.54x = 436,036,331.24
  5. Step 5: Solve for x
    x = 436,036,331.24/21,228.54
  6. Step 6: Final answer
    x = 20,540.10

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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.