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Finding the Fourth Proportional to 228,963.84, 315,976.32 and 128,359.68

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Solution

The fourth proportional to 228,963.84, 315,976.32 and 128,359.68 is: 177,139.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    228,963.84 : 315,976.32 = 128,359.68 : x
  2. Step 2: Convert to fraction form
    228,963.84/315,976.32 = 128,359.68/x
  3. Step 3: Cross multiply
    228,963.84x = 315,976.32 × 128,359.68
  4. Step 4: Simplify right side
    228,963.84x = 40,558,619,322.78
  5. Step 5: Solve for x
    x = 40,558,619,322.78/228,963.84
  6. Step 6: Final answer
    x = 177,139.85

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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.