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Finding the Fourth Proportional to 12,378.70, 18,568.05 and 4,170.70

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Solution

The fourth proportional to 12,378.70, 18,568.05 and 4,170.70 is: 6,256.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,378.70 : 18,568.05 = 4,170.70 : x
  2. Step 2: Convert to fraction form
    12,378.70/18,568.05 = 4,170.70/x
  3. Step 3: Cross multiply
    12,378.70x = 18,568.05 × 4,170.70
  4. Step 4: Simplify right side
    12,378.70x = 77,441,766.14
  5. Step 5: Solve for x
    x = 77,441,766.14/12,378.70
  6. Step 6: Final answer
    x = 6,256.05

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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.