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Finding the Fourth Proportional to 13,191.40, 19,787.10 and 12,327.40

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Solution

The fourth proportional to 13,191.40, 19,787.10 and 12,327.40 is: 18,491.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,191.40 : 19,787.10 = 12,327.40 : x
  2. Step 2: Convert to fraction form
    13,191.40/19,787.10 = 12,327.40/x
  3. Step 3: Cross multiply
    13,191.40x = 19,787.10 × 12,327.40
  4. Step 4: Simplify right side
    13,191.40x = 243,923,496.54
  5. Step 5: Solve for x
    x = 243,923,496.54/13,191.40
  6. Step 6: Final answer
    x = 18,491.10

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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.