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Finding the Fourth Proportional to 39,717.53, 54,811.14 and 21,812.92

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Solution

The fourth proportional to 39,717.53, 54,811.14 and 21,812.92 is: 30,102.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,717.53 : 54,811.14 = 21,812.92 : x
  2. Step 2: Convert to fraction form
    39,717.53/54,811.14 = 21,812.92/x
  3. Step 3: Cross multiply
    39,717.53x = 54,811.14 × 21,812.92
  4. Step 4: Simplify right side
    39,717.53x = 1,195,591,162.24
  5. Step 5: Solve for x
    x = 1,195,591,162.24/39,717.53
  6. Step 6: Final answer
    x = 30,102.36

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.