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Finding the Fourth Proportional to 30,900.20, 42,677.32 and 20,811.12

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Solution

The fourth proportional to 30,900.20, 42,677.32 and 20,811.12 is: 28,742.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,900.20 : 42,677.32 = 20,811.12 : x
  2. Step 2: Convert to fraction form
    30,900.20/42,677.32 = 20,811.12/x
  3. Step 3: Cross multiply
    30,900.20x = 42,677.32 × 20,811.12
  4. Step 4: Simplify right side
    30,900.20x = 888,162,827.80
  5. Step 5: Solve for x
    x = 888,162,827.80/30,900.20
  6. Step 6: Final answer
    x = 28,742.95

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