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Finding the Fourth Proportional to 39,720.62, 54,814.84 and 21,816

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Solution

The fourth proportional to 39,720.62, 54,814.84 and 21,816 is: 30,106.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,720.62 : 54,814.84 = 21,816 : x
  2. Step 2: Convert to fraction form
    39,720.62/54,814.84 = 21,816/x
  3. Step 3: Cross multiply
    39,720.62x = 54,814.84 × 21,816
  4. Step 4: Simplify right side
    39,720.62x = 1,195,840,549.44
  5. Step 5: Solve for x
    x = 1,195,840,549.44/39,720.62
  6. Step 6: Final answer
    x = 30,106.29

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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.