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Finding the Fourth Proportional to 287,395.67, 396,536.08 and 189,268.78

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Solution

The fourth proportional to 287,395.67, 396,536.08 and 189,268.78 is: 261,144.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,395.67 : 396,536.08 = 189,268.78 : x
  2. Step 2: Convert to fraction form
    287,395.67/396,536.08 = 189,268.78/x
  3. Step 3: Cross multiply
    287,395.67x = 396,536.08 × 189,268.78
  4. Step 4: Simplify right side
    287,395.67x = 75,051,900,087.58
  5. Step 5: Solve for x
    x = 75,051,900,087.58/287,395.67
  6. Step 6: Final answer
    x = 261,144.85

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1.5x scale

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.