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Finding the Fourth Proportional to 13,989.12, 20,963.90 and 7,751.99

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Solution

The fourth proportional to 13,989.12, 20,963.90 and 7,751.99 is: 11,617.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,989.12 : 20,963.90 = 7,751.99 : x
  2. Step 2: Convert to fraction form
    13,989.12/20,963.90 = 7,751.99/x
  3. Step 3: Cross multiply
    13,989.12x = 20,963.90 × 7,751.99
  4. Step 4: Simplify right side
    13,989.12x = 162,511,799.58
  5. Step 5: Solve for x
    x = 162,511,799.58/13,989.12
  6. Step 6: Final answer
    x = 11,617.01

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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.