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Finding the Fourth Proportional to 12,990.36, 17,938.18 and 8,219.04

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Solution

The fourth proportional to 12,990.36, 17,938.18 and 8,219.04 is: 11,349.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.36 : 17,938.18 = 8,219.04 : x
  2. Step 2: Convert to fraction form
    12,990.36/17,938.18 = 8,219.04/x
  3. Step 3: Cross multiply
    12,990.36x = 17,938.18 × 8,219.04
  4. Step 4: Simplify right side
    12,990.36x = 147,434,618.95
  5. Step 5: Solve for x
    x = 147,434,618.95/12,990.36
  6. Step 6: Final answer
    x = 11,349.54

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1.5x scale

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.