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Finding the Fourth Proportional to 71,638.82, 98,792.42 and 47,428.73

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Solution

The fourth proportional to 71,638.82, 98,792.42 and 47,428.73 is: 65,405.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,638.82 : 98,792.42 = 47,428.73 : x
  2. Step 2: Convert to fraction form
    71,638.82/98,792.42 = 47,428.73/x
  3. Step 3: Cross multiply
    71,638.82x = 98,792.42 × 47,428.73
  4. Step 4: Simplify right side
    71,638.82x = 4,685,599,014.23
  5. Step 5: Solve for x
    x = 4,685,599,014.23/71,638.82
  6. Step 6: Final answer
    x = 65,405.87

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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.