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Finding the Fourth Proportional to 13,355.40, 19,994.70 and 8,171.40

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Solution

The fourth proportional to 13,355.40, 19,994.70 and 8,171.40 is: 12,233.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,355.40 : 19,994.70 = 8,171.40 : x
  2. Step 2: Convert to fraction form
    13,355.40/19,994.70 = 8,171.40/x
  3. Step 3: Cross multiply
    13,355.40x = 19,994.70 × 8,171.40
  4. Step 4: Simplify right side
    13,355.40x = 163,384,691.58
  5. Step 5: Solve for x
    x = 163,384,691.58/13,355.40
  6. Step 6: Final answer
    x = 12,233.61

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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.