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Finding the Fourth Proportional to 13,440.60, 20,160.90 and 13,221.90

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Solution

The fourth proportional to 13,440.60, 20,160.90 and 13,221.90 is: 19,832.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,440.60 : 20,160.90 = 13,221.90 : x
  2. Step 2: Convert to fraction form
    13,440.60/20,160.90 = 13,221.90/x
  3. Step 3: Cross multiply
    13,440.60x = 20,160.90 × 13,221.90
  4. Step 4: Simplify right side
    13,440.60x = 266,565,403.71
  5. Step 5: Solve for x
    x = 266,565,403.71/13,440.60
  6. Step 6: Final answer
    x = 19,832.85

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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.