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Finding the Fourth Proportional to 20,930.70, 31,396.05 and 7,079.70

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Solution

The fourth proportional to 20,930.70, 31,396.05 and 7,079.70 is: 10,619.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.70 : 31,396.05 = 7,079.70 : x
  2. Step 2: Convert to fraction form
    20,930.70/31,396.05 = 7,079.70/x
  3. Step 3: Cross multiply
    20,930.70x = 31,396.05 × 7,079.70
  4. Step 4: Simplify right side
    20,930.70x = 222,274,615.19
  5. Step 5: Solve for x
    x = 222,274,615.19/20,930.70
  6. Step 6: Final answer
    x = 10,619.55

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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.