Home / 21,555.28-29,745.20-12,123.28

Finding the Fourth Proportional to 21,555.28, 29,745.20 and 12,123.28

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Solution

The fourth proportional to 21,555.28, 29,745.20 and 12,123.28 is: 16,729.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,555.28 : 29,745.20 = 12,123.28 : x
  2. Step 2: Convert to fraction form
    21,555.28/29,745.20 = 12,123.28/x
  3. Step 3: Cross multiply
    21,555.28x = 29,745.20 × 12,123.28
  4. Step 4: Simplify right side
    21,555.28x = 360,609,388.26
  5. Step 5: Solve for x
    x = 360,609,388.26/21,555.28
  6. Step 6: Final answer
    x = 16,729.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.