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Finding the Fourth Proportional to 21,959.26, 32,939.38 and 7,920.42

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Solution

The fourth proportional to 21,959.26, 32,939.38 and 7,920.42 is: 11,880.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,959.26 : 32,939.38 = 7,920.42 : x
  2. Step 2: Convert to fraction form
    21,959.26/32,939.38 = 7,920.42/x
  3. Step 3: Cross multiply
    21,959.26x = 32,939.38 × 7,920.42
  4. Step 4: Simplify right side
    21,959.26x = 260,893,724.14
  5. Step 5: Solve for x
    x = 260,893,724.14/21,959.26
  6. Step 6: Final answer
    x = 11,880.81

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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.