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Finding the Fourth Proportional to 22,283.76, 30,686.78 and 20,859.15

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Solution

The fourth proportional to 22,283.76, 30,686.78 and 20,859.15 is: 28,724.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,283.76 : 30,686.78 = 20,859.15 : x
  2. Step 2: Convert to fraction form
    22,283.76/30,686.78 = 20,859.15/x
  3. Step 3: Cross multiply
    22,283.76x = 30,686.78 × 20,859.15
  4. Step 4: Simplify right side
    22,283.76x = 640,100,042.74
  5. Step 5: Solve for x
    x = 640,100,042.74/22,283.76
  6. Step 6: Final answer
    x = 28,724.96

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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.