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Finding the Fourth Proportional to 13,781.70, 20,672.55 and 5,015.48

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Solution

The fourth proportional to 13,781.70, 20,672.55 and 5,015.48 is: 7,523.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.70 : 20,672.55 = 5,015.48 : x
  2. Step 2: Convert to fraction form
    13,781.70/20,672.55 = 5,015.48/x
  3. Step 3: Cross multiply
    13,781.70x = 20,672.55 × 5,015.48
  4. Step 4: Simplify right side
    13,781.70x = 103,682,657.71
  5. Step 5: Solve for x
    x = 103,682,657.71/13,781.70
  6. Step 6: Final answer
    x = 7,523.21

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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.