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Finding the Fourth Proportional to 20,691.56, 30,977.50 and 18,554.99

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Solution

The fourth proportional to 20,691.56, 30,977.50 and 18,554.99 is: 27,778.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,691.56 : 30,977.50 = 18,554.99 : x
  2. Step 2: Convert to fraction form
    20,691.56/30,977.50 = 18,554.99/x
  3. Step 3: Cross multiply
    20,691.56x = 30,977.50 × 18,554.99
  4. Step 4: Simplify right side
    20,691.56x = 574,787,001.45
  5. Step 5: Solve for x
    x = 574,787,001.45/20,691.56
  6. Step 6: Final answer
    x = 27,778.81

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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.