Home / 19,991.94-29,990.87-6,660.55

Finding the Fourth Proportional to 19,991.94, 29,990.87 and 6,660.55

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Solution

The fourth proportional to 19,991.94, 29,990.87 and 6,660.55 is: 9,991.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,991.94 : 29,990.87 = 6,660.55 : x
  2. Step 2: Convert to fraction form
    19,991.94/29,990.87 = 6,660.55/x
  3. Step 3: Cross multiply
    19,991.94x = 29,990.87 × 6,660.55
  4. Step 4: Simplify right side
    19,991.94x = 199,755,689.18
  5. Step 5: Solve for x
    x = 199,755,689.18/19,991.94
  6. Step 6: Final answer
    x = 9,991.81

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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.