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Finding the Fourth Proportional to 20,822.80, 28,735.21 and 11,870.01

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Solution

The fourth proportional to 20,822.80, 28,735.21 and 11,870.01 is: 16,380.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,822.80 : 28,735.21 = 11,870.01 : x
  2. Step 2: Convert to fraction form
    20,822.80/28,735.21 = 11,870.01/x
  3. Step 3: Cross multiply
    20,822.80x = 28,735.21 × 11,870.01
  4. Step 4: Simplify right side
    20,822.80x = 341,087,230.05
  5. Step 5: Solve for x
    x = 341,087,230.05/20,822.80
  6. Step 6: Final answer
    x = 16,380.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.