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Finding the Fourth Proportional to 28,409.76, 42,616.32 and 8,689.68

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Solution

The fourth proportional to 28,409.76, 42,616.32 and 8,689.68 is: 13,035.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,409.76 : 42,616.32 = 8,689.68 : x
  2. Step 2: Convert to fraction form
    28,409.76/42,616.32 = 8,689.68/x
  3. Step 3: Cross multiply
    28,409.76x = 42,616.32 × 8,689.68
  4. Step 4: Simplify right side
    28,409.76x = 370,322,183.58
  5. Step 5: Solve for x
    x = 370,322,183.58/28,409.76
  6. Step 6: Final answer
    x = 13,035.03

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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.