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Finding the Fourth Proportional to 13,998.79, 20,990.90 and 5,226.49

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Solution

The fourth proportional to 13,998.79, 20,990.90 and 5,226.49 is: 7,837.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,998.79 : 20,990.90 = 5,226.49 : x
  2. Step 2: Convert to fraction form
    13,998.79/20,990.90 = 5,226.49/x
  3. Step 3: Cross multiply
    13,998.79x = 20,990.90 × 5,226.49
  4. Step 4: Simplify right side
    13,998.79x = 109,708,702.81
  5. Step 5: Solve for x
    x = 109,708,702.81/13,998.79
  6. Step 6: Final answer
    x = 7,837.01

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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.