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Finding the Fourth Proportional to 20,807.80, 31,211.70 and 14,126.20

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Solution

The fourth proportional to 20,807.80, 31,211.70 and 14,126.20 is: 21,189.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,807.80 : 31,211.70 = 14,126.20 : x
  2. Step 2: Convert to fraction form
    20,807.80/31,211.70 = 14,126.20/x
  3. Step 3: Cross multiply
    20,807.80x = 31,211.70 × 14,126.20
  4. Step 4: Simplify right side
    20,807.80x = 440,902,716.54
  5. Step 5: Solve for x
    x = 440,902,716.54/20,807.80
  6. Step 6: Final answer
    x = 21,189.30

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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.