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Finding the Fourth Proportional to 128,743.97, 177,728.85 and 85,794.93

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Solution

The fourth proportional to 128,743.97, 177,728.85 and 85,794.93 is: 118,438.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,743.97 : 177,728.85 = 85,794.93 : x
  2. Step 2: Convert to fraction form
    128,743.97/177,728.85 = 85,794.93/x
  3. Step 3: Cross multiply
    128,743.97x = 177,728.85 × 85,794.93
  4. Step 4: Simplify right side
    128,743.97x = 15,248,234,244.73
  5. Step 5: Solve for x
    x = 15,248,234,244.73/128,743.97
  6. Step 6: Final answer
    x = 118,438.44

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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.