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Finding the Fourth Proportional to 39,717.51, 54,811.12 and 21,812.90

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Solution

The fourth proportional to 39,717.51, 54,811.12 and 21,812.90 is: 30,102.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,717.51 : 54,811.12 = 21,812.90 : x
  2. Step 2: Convert to fraction form
    39,717.51/54,811.12 = 21,812.90/x
  3. Step 3: Cross multiply
    39,717.51x = 54,811.12 × 21,812.90
  4. Step 4: Simplify right side
    39,717.51x = 1,195,589,479.45
  5. Step 5: Solve for x
    x = 1,195,589,479.45/39,717.51
  6. Step 6: Final answer
    x = 30,102.33

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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.