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Finding the Fourth Proportional to 77,638.56, 107,110.80 and 47,778.72

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Solution

The fourth proportional to 77,638.56, 107,110.80 and 47,778.72 is: 65,915.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,638.56 : 107,110.80 = 47,778.72 : x
  2. Step 2: Convert to fraction form
    77,638.56/107,110.80 = 47,778.72/x
  3. Step 3: Cross multiply
    77,638.56x = 107,110.80 × 47,778.72
  4. Step 4: Simplify right side
    77,638.56x = 5,117,616,922.18
  5. Step 5: Solve for x
    x = 5,117,616,922.18/77,638.56
  6. Step 6: Final answer
    x = 65,915.92

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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.