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Finding the Fourth Proportional to 17,990.78, 26,991.44 and 9,231.80

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Solution

The fourth proportional to 17,990.78, 26,991.44 and 9,231.80 is: 13,850.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,990.78 : 26,991.44 = 9,231.80 : x
  2. Step 2: Convert to fraction form
    17,990.78/26,991.44 = 9,231.80/x
  3. Step 3: Cross multiply
    17,990.78x = 26,991.44 × 9,231.80
  4. Step 4: Simplify right side
    17,990.78x = 249,179,575.79
  5. Step 5: Solve for x
    x = 249,179,575.79/17,990.78
  6. Step 6: Final answer
    x = 13,850.40

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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.