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Finding the Fourth Proportional to 74,801.72, 112,169.74 and 28,021.80

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Solution

The fourth proportional to 74,801.72, 112,169.74 and 28,021.80 is: 42,020.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,801.72 : 112,169.74 = 28,021.80 : x
  2. Step 2: Convert to fraction form
    74,801.72/112,169.74 = 28,021.80/x
  3. Step 3: Cross multiply
    74,801.72x = 112,169.74 × 28,021.80
  4. Step 4: Simplify right side
    74,801.72x = 3,143,198,020.33
  5. Step 5: Solve for x
    x = 3,143,198,020.33/74,801.72
  6. Step 6: Final answer
    x = 42,020.40

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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.