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Finding the Fourth Proportional to 74,720.80, 103,015.52 and 61,926

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Solution

The fourth proportional to 74,720.80, 103,015.52 and 61,926 is: 85,375.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,720.80 : 103,015.52 = 61,926 : x
  2. Step 2: Convert to fraction form
    74,720.80/103,015.52 = 61,926/x
  3. Step 3: Cross multiply
    74,720.80x = 103,015.52 × 61,926
  4. Step 4: Simplify right side
    74,720.80x = 6,379,339,091.52
  5. Step 5: Solve for x
    x = 6,379,339,091.52/74,720.80
  6. Step 6: Final answer
    x = 85,375.68

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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.