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Finding the Fourth Proportional to 128,001.75, 191,915.15 and 78,099.27

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Solution

The fourth proportional to 128,001.75, 191,915.15 and 78,099.27 is: 117,095.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,001.75 : 191,915.15 = 78,099.27 : x
  2. Step 2: Convert to fraction form
    128,001.75/191,915.15 = 78,099.27/x
  3. Step 3: Cross multiply
    128,001.75x = 191,915.15 × 78,099.27
  4. Step 4: Simplify right side
    128,001.75x = 14,988,432,726.44
  5. Step 5: Solve for x
    x = 14,988,432,726.44/128,001.75
  6. Step 6: Final answer
    x = 117,095.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.