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Finding the Fourth Proportional to 9,991.80, 14,961.30 and 8,008.20

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Solution

The fourth proportional to 9,991.80, 14,961.30 and 8,008.20 is: 11,991.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,991.80 : 14,961.30 = 8,008.20 : x
  2. Step 2: Convert to fraction form
    9,991.80/14,961.30 = 8,008.20/x
  3. Step 3: Cross multiply
    9,991.80x = 14,961.30 × 8,008.20
  4. Step 4: Simplify right side
    9,991.80x = 119,813,082.66
  5. Step 5: Solve for x
    x = 119,813,082.66/9,991.80
  6. Step 6: Final answer
    x = 11,991.14

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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.