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Finding the Fourth Proportional to 21,808.70, 32,713.05 and 20,123.90

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Solution

The fourth proportional to 21,808.70, 32,713.05 and 20,123.90 is: 30,185.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,808.70 : 32,713.05 = 20,123.90 : x
  2. Step 2: Convert to fraction form
    21,808.70/32,713.05 = 20,123.90/x
  3. Step 3: Cross multiply
    21,808.70x = 32,713.05 × 20,123.90
  4. Step 4: Simplify right side
    21,808.70x = 658,314,146.90
  5. Step 5: Solve for x
    x = 658,314,146.90/21,808.70
  6. Step 6: Final answer
    x = 30,185.85

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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.