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Finding the Fourth Proportional to 228,928.38, 315,920.17 and 128,326.38

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Solution

The fourth proportional to 228,928.38, 315,920.17 and 128,326.38 is: 177,089.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,928.38 : 315,920.17 = 128,326.38 : x
  2. Step 2: Convert to fraction form
    228,928.38/315,920.17 = 128,326.38/x
  3. Step 3: Cross multiply
    228,928.38x = 315,920.17 × 128,326.38
  4. Step 4: Simplify right side
    228,928.38x = 40,540,891,785.08
  5. Step 5: Solve for x
    x = 40,540,891,785.08/228,928.38
  6. Step 6: Final answer
    x = 177,089.85

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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.