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Finding the Fourth Proportional to 128,617.38, 177,394.41 and 112,674.15

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Solution

The fourth proportional to 128,617.38, 177,394.41 and 112,674.15 is: 155,404.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,617.38 : 177,394.41 = 112,674.15 : x
  2. Step 2: Convert to fraction form
    128,617.38/177,394.41 = 112,674.15/x
  3. Step 3: Cross multiply
    128,617.38x = 177,394.41 × 112,674.15
  4. Step 4: Simplify right side
    128,617.38x = 19,987,764,361.50
  5. Step 5: Solve for x
    x = 19,987,764,361.50/128,617.38
  6. Step 6: Final answer
    x = 155,404.85

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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.