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Finding the Fourth Proportional to 12,480.36, 18,715.36 and 5,079.78

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Solution

The fourth proportional to 12,480.36, 18,715.36 and 5,079.78 is: 7,617.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,480.36 : 18,715.36 = 5,079.78 : x
  2. Step 2: Convert to fraction form
    12,480.36/18,715.36 = 5,079.78/x
  3. Step 3: Cross multiply
    12,480.36x = 18,715.36 × 5,079.78
  4. Step 4: Simplify right side
    12,480.36x = 95,069,911.42
  5. Step 5: Solve for x
    x = 95,069,911.42/12,480.36
  6. Step 6: Final answer
    x = 7,617.56

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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.