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Finding the Fourth Proportional to 75,020.78, 103,479.90 and 48,120.68

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Solution

The fourth proportional to 75,020.78, 103,479.90 and 48,120.68 is: 66,375.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    75,020.78 : 103,479.90 = 48,120.68 : x
  2. Step 2: Convert to fraction form
    75,020.78/103,479.90 = 48,120.68/x
  3. Step 3: Cross multiply
    75,020.78x = 103,479.90 × 48,120.68
  4. Step 4: Simplify right side
    75,020.78x = 4,979,523,154.33
  5. Step 5: Solve for x
    x = 4,979,523,154.33/75,020.78
  6. Step 6: Final answer
    x = 66,375.25

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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.