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Finding the Fourth Proportional to 22,189.80, 30,622.90 and 12,761.48

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Solution

The fourth proportional to 22,189.80, 30,622.90 and 12,761.48 is: 17,611.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,189.80 : 30,622.90 = 12,761.48 : x
  2. Step 2: Convert to fraction form
    22,189.80/30,622.90 = 12,761.48/x
  3. Step 3: Cross multiply
    22,189.80x = 30,622.90 × 12,761.48
  4. Step 4: Simplify right side
    22,189.80x = 390,793,525.89
  5. Step 5: Solve for x
    x = 390,793,525.89/22,189.80
  6. Step 6: Final answer
    x = 17,611.40

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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.