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Finding the Fourth Proportional to 128,715.70, 177,627.72 and 78,414.70

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Solution

The fourth proportional to 128,715.70, 177,627.72 and 78,414.70 is: 108,212.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,715.70 : 177,627.72 = 78,414.70 : x
  2. Step 2: Convert to fraction form
    128,715.70/177,627.72 = 78,414.70/x
  3. Step 3: Cross multiply
    128,715.70x = 177,627.72 × 78,414.70
  4. Step 4: Simplify right side
    128,715.70x = 13,928,624,375.48
  5. Step 5: Solve for x
    x = 13,928,624,375.48/128,715.70
  6. Step 6: Final answer
    x = 108,212.32

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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.