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Finding the Fourth Proportional to 13,990.56, 19,308.96 and 8,691.12

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Solution

The fourth proportional to 13,990.56, 19,308.96 and 8,691.12 is: 11,994.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.56 : 19,308.96 = 8,691.12 : x
  2. Step 2: Convert to fraction form
    13,990.56/19,308.96 = 8,691.12/x
  3. Step 3: Cross multiply
    13,990.56x = 19,308.96 × 8,691.12
  4. Step 4: Simplify right side
    13,990.56x = 167,816,488.44
  5. Step 5: Solve for x
    x = 167,816,488.44/13,990.56
  6. Step 6: Final answer
    x = 11,994.98

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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.