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Finding the Fourth Proportional to 128,616.88, 177,552.90 and 85,667.84

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Solution

The fourth proportional to 128,616.88, 177,552.90 and 85,667.84 is: 118,262.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,616.88 : 177,552.90 = 85,667.84 : x
  2. Step 2: Convert to fraction form
    128,616.88/177,552.90 = 85,667.84/x
  3. Step 3: Cross multiply
    128,616.88x = 177,552.90 × 85,667.84
  4. Step 4: Simplify right side
    128,616.88x = 15,210,573,428.74
  5. Step 5: Solve for x
    x = 15,210,573,428.74/128,616.88
  6. Step 6: Final answer
    x = 118,262.65

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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.