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Finding the Fourth Proportional to 71,638.93, 98,856.92 and 39,372.85

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Solution

The fourth proportional to 71,638.93, 98,856.92 and 39,372.85 is: 54,331.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,638.93 : 98,856.92 = 39,372.85 : x
  2. Step 2: Convert to fraction form
    71,638.93/98,856.92 = 39,372.85/x
  3. Step 3: Cross multiply
    71,638.93x = 98,856.92 × 39,372.85
  4. Step 4: Simplify right side
    71,638.93x = 3,892,278,904.63
  5. Step 5: Solve for x
    x = 3,892,278,904.63/71,638.93
  6. Step 6: Final answer
    x = 54,331.90

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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.