Home / 21,040.40-31,522.20-12,822.80

Finding the Fourth Proportional to 21,040.40, 31,522.20 and 12,822.80

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Solution

The fourth proportional to 21,040.40, 31,522.20 and 12,822.80 is: 19,210.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,040.40 : 31,522.20 = 12,822.80 : x
  2. Step 2: Convert to fraction form
    21,040.40/31,522.20 = 12,822.80/x
  3. Step 3: Cross multiply
    21,040.40x = 31,522.20 × 12,822.80
  4. Step 4: Simplify right side
    21,040.40x = 404,202,866.16
  5. Step 5: Solve for x
    x = 404,202,866.16/21,040.40
  6. Step 6: Final answer
    x = 19,210.80

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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.