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Finding the Fourth Proportional to 28,561.64, 42,870.12 and 13,780.92

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Solution

The fourth proportional to 28,561.64, 42,870.12 and 13,780.92 is: 20,684.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,561.64 : 42,870.12 = 13,780.92 : x
  2. Step 2: Convert to fraction form
    28,561.64/42,870.12 = 13,780.92/x
  3. Step 3: Cross multiply
    28,561.64x = 42,870.12 × 13,780.92
  4. Step 4: Simplify right side
    28,561.64x = 590,789,694.11
  5. Step 5: Solve for x
    x = 590,789,694.11/28,561.64
  6. Step 6: Final answer
    x = 20,684.73

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.