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Finding the Fourth Proportional to 13,781.52, 20,659.68 and 5,987.52

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Solution

The fourth proportional to 13,781.52, 20,659.68 and 5,987.52 is: 8,975.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.52 : 20,659.68 = 5,987.52 : x
  2. Step 2: Convert to fraction form
    13,781.52/20,659.68 = 5,987.52/x
  3. Step 3: Cross multiply
    13,781.52x = 20,659.68 × 5,987.52
  4. Step 4: Simplify right side
    13,781.52x = 123,700,247.19
  5. Step 5: Solve for x
    x = 123,700,247.19/13,781.52
  6. Step 6: Final answer
    x = 8,975.81

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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.