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Finding the Fourth Proportional to 128,386.11, 177,181.53 and 71,797.89

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Solution

The fourth proportional to 128,386.11, 177,181.53 and 71,797.89 is: 99,085.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,386.11 : 177,181.53 = 71,797.89 : x
  2. Step 2: Convert to fraction form
    128,386.11/177,181.53 = 71,797.89/x
  3. Step 3: Cross multiply
    128,386.11x = 177,181.53 × 71,797.89
  4. Step 4: Simplify right side
    128,386.11x = 12,721,260,000.97
  5. Step 5: Solve for x
    x = 12,721,260,000.97/128,386.11
  6. Step 6: Final answer
    x = 99,085.95

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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.