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Finding the Fourth Proportional to 9,369.76, 12,929.92 and 5,178.08

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Solution

The fourth proportional to 9,369.76, 12,929.92 and 5,178.08 is: 7,145.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,369.76 : 12,929.92 = 5,178.08 : x
  2. Step 2: Convert to fraction form
    9,369.76/12,929.92 = 5,178.08/x
  3. Step 3: Cross multiply
    9,369.76x = 12,929.92 × 5,178.08
  4. Step 4: Simplify right side
    9,369.76x = 66,952,160.15
  5. Step 5: Solve for x
    x = 66,952,160.15/9,369.76
  6. Step 6: Final answer
    x = 7,145.56

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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.