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Finding the Fourth Proportional to 20,959.54, 31,442.43 and 6,921.05

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Solution

The fourth proportional to 20,959.54, 31,442.43 and 6,921.05 is: 10,382.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,959.54 : 31,442.43 = 6,921.05 : x
  2. Step 2: Convert to fraction form
    20,959.54/31,442.43 = 6,921.05/x
  3. Step 3: Cross multiply
    20,959.54x = 31,442.43 × 6,921.05
  4. Step 4: Simplify right side
    20,959.54x = 217,614,472.94
  5. Step 5: Solve for x
    x = 217,614,472.94/20,959.54
  6. Step 6: Final answer
    x = 10,382.60

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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.