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Finding the Fourth Proportional to 39,718.75, 54,812.25 and 21,814.13

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Solution

The fourth proportional to 39,718.75, 54,812.25 and 21,814.13 is: 30,103.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,718.75 : 54,812.25 = 21,814.13 : x
  2. Step 2: Convert to fraction form
    39,718.75/54,812.25 = 21,814.13/x
  3. Step 3: Cross multiply
    39,718.75x = 54,812.25 × 21,814.13
  4. Step 4: Simplify right side
    39,718.75x = 1,195,681,273.03
  5. Step 5: Solve for x
    x = 1,195,681,273.03/39,718.75
  6. Step 6: Final answer
    x = 30,103.70

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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.