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Finding the Fourth Proportional to 128,915.85, 177,901.11 and 71,551.82

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Solution

The fourth proportional to 128,915.85, 177,901.11 and 71,551.82 is: 98,739.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,915.85 : 177,901.11 = 71,551.82 : x
  2. Step 2: Convert to fraction form
    128,915.85/177,901.11 = 71,551.82/x
  3. Step 3: Cross multiply
    128,915.85x = 177,901.11 × 71,551.82
  4. Step 4: Simplify right side
    128,915.85x = 12,729,148,645.27
  5. Step 5: Solve for x
    x = 12,729,148,645.27/128,915.85
  6. Step 6: Final answer
    x = 98,739.98

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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.