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Finding the Fourth Proportional to 22,790.40, 34,220.80 and 12,422.40

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Solution

The fourth proportional to 22,790.40, 34,220.80 and 12,422.40 is: 18,652.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,790.40 : 34,220.80 = 12,422.40 : x
  2. Step 2: Convert to fraction form
    22,790.40/34,220.80 = 12,422.40/x
  3. Step 3: Cross multiply
    22,790.40x = 34,220.80 × 12,422.40
  4. Step 4: Simplify right side
    22,790.40x = 425,104,465.92
  5. Step 5: Solve for x
    x = 425,104,465.92/22,790.40
  6. Step 6: Final answer
    x = 18,652.79

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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.