Home / 12,990.33-17,921.75-8,208.90

Finding the Fourth Proportional to 12,990.33, 17,921.75 and 8,208.90

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Solution

The fourth proportional to 12,990.33, 17,921.75 and 8,208.90 is: 11,325.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,990.33 : 17,921.75 = 8,208.90 : x
  2. Step 2: Convert to fraction form
    12,990.33/17,921.75 = 8,208.90/x
  3. Step 3: Cross multiply
    12,990.33x = 17,921.75 × 8,208.90
  4. Step 4: Simplify right side
    12,990.33x = 147,117,812.53
  5. Step 5: Solve for x
    x = 147,117,812.53/12,990.33
  6. Step 6: Final answer
    x = 11,325.18

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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.