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Finding the Fourth Proportional to 13,671.18, 20,431.83 and 9,981.18

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Solution

The fourth proportional to 13,671.18, 20,431.83 and 9,981.18 is: 14,917.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,671.18 : 20,431.83 = 9,981.18 : x
  2. Step 2: Convert to fraction form
    13,671.18/20,431.83 = 9,981.18/x
  3. Step 3: Cross multiply
    13,671.18x = 20,431.83 × 9,981.18
  4. Step 4: Simplify right side
    13,671.18x = 203,933,772.96
  5. Step 5: Solve for x
    x = 203,933,772.96/13,671.18
  6. Step 6: Final answer
    x = 14,917.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.