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Finding the Fourth Proportional to 21,939.59, 32,879.56 and 9,278.82

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Solution

The fourth proportional to 21,939.59, 32,879.56 and 9,278.82 is: 13,905.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.59 : 32,879.56 = 9,278.82 : x
  2. Step 2: Convert to fraction form
    21,939.59/32,879.56 = 9,278.82/x
  3. Step 3: Cross multiply
    21,939.59x = 32,879.56 × 9,278.82
  4. Step 4: Simplify right side
    21,939.59x = 305,083,472.53
  5. Step 5: Solve for x
    x = 305,083,472.53/21,939.59
  6. Step 6: Final answer
    x = 13,905.62

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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.