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Finding the Fourth Proportional to 13,811.16, 20,716.56 and 3,950.40

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Solution

The fourth proportional to 13,811.16, 20,716.56 and 3,950.40 is: 5,925.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,811.16 : 20,716.56 = 3,950.40 : x
  2. Step 2: Convert to fraction form
    13,811.16/20,716.56 = 3,950.40/x
  3. Step 3: Cross multiply
    13,811.16x = 20,716.56 × 3,950.40
  4. Step 4: Simplify right side
    13,811.16x = 81,838,698.62
  5. Step 5: Solve for x
    x = 81,838,698.62/13,811.16
  6. Step 6: Final answer
    x = 5,925.55

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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.