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Finding the Fourth Proportional to 74,383.21, 111,574.77 and 18,979.21

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Solution

The fourth proportional to 74,383.21, 111,574.77 and 18,979.21 is: 28,468.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,383.21 : 111,574.77 = 18,979.21 : x
  2. Step 2: Convert to fraction form
    74,383.21/111,574.77 = 18,979.21/x
  3. Step 3: Cross multiply
    74,383.21x = 111,574.77 × 18,979.21
  4. Step 4: Simplify right side
    74,383.21x = 2,117,600,990.53
  5. Step 5: Solve for x
    x = 2,117,600,990.53/74,383.21
  6. Step 6: Final answer
    x = 28,468.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.