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Finding the Fourth Proportional to 13,191.80, 19,787.70 and 12,116.60

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Solution

The fourth proportional to 13,191.80, 19,787.70 and 12,116.60 is: 18,174.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,191.80 : 19,787.70 = 12,116.60 : x
  2. Step 2: Convert to fraction form
    13,191.80/19,787.70 = 12,116.60/x
  3. Step 3: Cross multiply
    13,191.80x = 19,787.70 × 12,116.60
  4. Step 4: Simplify right side
    13,191.80x = 239,759,645.82
  5. Step 5: Solve for x
    x = 239,759,645.82/13,191.80
  6. Step 6: Final answer
    x = 18,174.90

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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.