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Finding the Fourth Proportional to 13,791.74, 20,685.65 and 3,931.74

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Solution

The fourth proportional to 13,791.74, 20,685.65 and 3,931.74 is: 5,897.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,791.74 : 20,685.65 = 3,931.74 : x
  2. Step 2: Convert to fraction form
    13,791.74/20,685.65 = 3,931.74/x
  3. Step 3: Cross multiply
    13,791.74x = 20,685.65 × 3,931.74
  4. Step 4: Simplify right side
    13,791.74x = 81,330,577.87
  5. Step 5: Solve for x
    x = 81,330,577.87/13,791.74
  6. Step 6: Final answer
    x = 5,897.05

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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.