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Finding the Fourth Proportional to 261,268.47, 391,968.57 and 74,279.97

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Solution

The fourth proportional to 261,268.47, 391,968.57 and 74,279.97 is: 111,438.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,268.47 : 391,968.57 = 74,279.97 : x
  2. Step 2: Convert to fraction form
    261,268.47/391,968.57 = 74,279.97/x
  3. Step 3: Cross multiply
    261,268.47x = 391,968.57 × 74,279.97
  4. Step 4: Simplify right side
    261,268.47x = 29,115,413,620.54
  5. Step 5: Solve for x
    x = 29,115,413,620.54/261,268.47
  6. Step 6: Final answer
    x = 111,438.68

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1.5x scale

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.