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Finding the Fourth Proportional to 22,155.70, 30,731.54 and 21,357.78

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Solution

The fourth proportional to 22,155.70, 30,731.54 and 21,357.78 is: 29,624.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,155.70 : 30,731.54 = 21,357.78 : x
  2. Step 2: Convert to fraction form
    22,155.70/30,731.54 = 21,357.78/x
  3. Step 3: Cross multiply
    22,155.70x = 30,731.54 × 21,357.78
  4. Step 4: Simplify right side
    22,155.70x = 656,357,470.38
  5. Step 5: Solve for x
    x = 656,357,470.38/22,155.70
  6. Step 6: Final answer
    x = 29,624.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.