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Finding the Fourth Proportional to 22,290.40, 33,424.80 and 12,419.20

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Solution

The fourth proportional to 22,290.40, 33,424.80 and 12,419.20 is: 18,622.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,290.40 : 33,424.80 = 12,419.20 : x
  2. Step 2: Convert to fraction form
    22,290.40/33,424.80 = 12,419.20/x
  3. Step 3: Cross multiply
    22,290.40x = 33,424.80 × 12,419.20
  4. Step 4: Simplify right side
    22,290.40x = 415,109,276.16
  5. Step 5: Solve for x
    x = 415,109,276.16/22,290.40
  6. Step 6: Final answer
    x = 18,622.78

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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.