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Finding the Fourth Proportional to 12,480.90, 18,721.28 and 5,085.90

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Solution

The fourth proportional to 12,480.90, 18,721.28 and 5,085.90 is: 7,628.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,480.90 : 18,721.28 = 5,085.90 : x
  2. Step 2: Convert to fraction form
    12,480.90/18,721.28 = 5,085.90/x
  3. Step 3: Cross multiply
    12,480.90x = 18,721.28 × 5,085.90
  4. Step 4: Simplify right side
    12,480.90x = 95,214,532.52
  5. Step 5: Solve for x
    x = 95,214,532.52/12,480.90
  6. Step 6: Final answer
    x = 7,628.82

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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.