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Finding the Fourth Proportional to 28,660.20, 42,987.06 and 7,881

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Solution

The fourth proportional to 28,660.20, 42,987.06 and 7,881 is: 11,820.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,660.20 : 42,987.06 = 7,881 : x
  2. Step 2: Convert to fraction form
    28,660.20/42,987.06 = 7,881/x
  3. Step 3: Cross multiply
    28,660.20x = 42,987.06 × 7,881
  4. Step 4: Simplify right side
    28,660.20x = 338,781,019.86
  5. Step 5: Solve for x
    x = 338,781,019.86/28,660.20
  6. Step 6: Final answer
    x = 11,820.61

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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.