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Finding the Fourth Proportional to 39,718.71, 54,811.74 and 21,813.87

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Solution

The fourth proportional to 39,718.71, 54,811.74 and 21,813.87 is: 30,103.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,718.71 : 54,811.74 = 21,813.87 : x
  2. Step 2: Convert to fraction form
    39,718.71/54,811.74 = 21,813.87/x
  3. Step 3: Cross multiply
    39,718.71x = 54,811.74 × 21,813.87
  4. Step 4: Simplify right side
    39,718.71x = 1,195,656,170.83
  5. Step 5: Solve for x
    x = 1,195,656,170.83/39,718.71
  6. Step 6: Final answer
    x = 30,103.10

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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.