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Finding the Fourth Proportional to 22,428.80, 33,643.20 and 20,679.20

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Solution

The fourth proportional to 22,428.80, 33,643.20 and 20,679.20 is: 31,018.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,428.80 : 33,643.20 = 20,679.20 : x
  2. Step 2: Convert to fraction form
    22,428.80/33,643.20 = 20,679.20/x
  3. Step 3: Cross multiply
    22,428.80x = 33,643.20 × 20,679.20
  4. Step 4: Simplify right side
    22,428.80x = 695,714,461.44
  5. Step 5: Solve for x
    x = 695,714,461.44/22,428.80
  6. Step 6: Final answer
    x = 31,018.80

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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.