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Finding the Fourth Proportional to 28,491.33, 42,742.68 and 8,769.15

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Solution

The fourth proportional to 28,491.33, 42,742.68 and 8,769.15 is: 13,155.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,491.33 : 42,742.68 = 8,769.15 : x
  2. Step 2: Convert to fraction form
    28,491.33/42,742.68 = 8,769.15/x
  3. Step 3: Cross multiply
    28,491.33x = 42,742.68 × 8,769.15
  4. Step 4: Simplify right side
    28,491.33x = 374,816,972.32
  5. Step 5: Solve for x
    x = 374,816,972.32/28,491.33
  6. Step 6: Final answer
    x = 13,155.47

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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.