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Finding the Fourth Proportional to 8,905, 12,288.92 and 5,179

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Solution

The fourth proportional to 8,905, 12,288.92 and 5,179 is: 7,147.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,905 : 12,288.92 = 5,179 : x
  2. Step 2: Convert to fraction form
    8,905/12,288.92 = 5,179/x
  3. Step 3: Cross multiply
    8,905x = 12,288.92 × 5,179
  4. Step 4: Simplify right side
    8,905x = 63,644,316.68
  5. Step 5: Solve for x
    x = 63,644,316.68/8,905
  6. Step 6: Final answer
    x = 7,147.03

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Why These Related Problems?

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