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Finding the Fourth Proportional to 20,959.42, 31,443.02 and 6,920.43

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Solution

The fourth proportional to 20,959.42, 31,443.02 and 6,920.43 is: 10,381.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,959.42 : 31,443.02 = 6,920.43 : x
  2. Step 2: Convert to fraction form
    20,959.42/31,443.02 = 6,920.43/x
  3. Step 3: Cross multiply
    20,959.42x = 31,443.02 × 6,920.43
  4. Step 4: Simplify right side
    20,959.42x = 217,599,218.90
  5. Step 5: Solve for x
    x = 217,599,218.90/20,959.42
  6. Step 6: Final answer
    x = 10,381.93

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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.