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Finding the Fourth Proportional to 20,506.20, 30,701.70 and 19,930.20

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Solution

The fourth proportional to 20,506.20, 30,701.70 and 19,930.20 is: 29,839.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,506.20 : 30,701.70 = 19,930.20 : x
  2. Step 2: Convert to fraction form
    20,506.20/30,701.70 = 19,930.20/x
  3. Step 3: Cross multiply
    20,506.20x = 30,701.70 × 19,930.20
  4. Step 4: Simplify right side
    20,506.20x = 611,891,021.34
  5. Step 5: Solve for x
    x = 611,891,021.34/20,506.20
  6. Step 6: Final answer
    x = 29,839.32

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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.