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Finding the Fourth Proportional to 13,640.79, 20,468.86 and 5,321.39

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Solution

The fourth proportional to 13,640.79, 20,468.86 and 5,321.39 is: 7,985.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,640.79 : 20,468.86 = 5,321.39 : x
  2. Step 2: Convert to fraction form
    13,640.79/20,468.86 = 5,321.39/x
  3. Step 3: Cross multiply
    13,640.79x = 20,468.86 × 5,321.39
  4. Step 4: Simplify right side
    13,640.79x = 108,922,671.27
  5. Step 5: Solve for x
    x = 108,922,671.27/13,640.79
  6. Step 6: Final answer
    x = 7,985.07

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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.