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Finding the Fourth Proportional to 12,618.54, 18,930.03 and 5,218.85

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Solution

The fourth proportional to 12,618.54, 18,930.03 and 5,218.85 is: 7,829.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,618.54 : 18,930.03 = 5,218.85 : x
  2. Step 2: Convert to fraction form
    12,618.54/18,930.03 = 5,218.85/x
  3. Step 3: Cross multiply
    12,618.54x = 18,930.03 × 5,218.85
  4. Step 4: Simplify right side
    12,618.54x = 98,792,987.07
  5. Step 5: Solve for x
    x = 98,792,987.07/12,618.54
  6. Step 6: Final answer
    x = 7,829.19

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1.5x scale

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.