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Finding the Fourth Proportional to 70,991.92, 97,969.80 and 39,160.72

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Solution

The fourth proportional to 70,991.92, 97,969.80 and 39,160.72 is: 54,042.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,991.92 : 97,969.80 = 39,160.72 : x
  2. Step 2: Convert to fraction form
    70,991.92/97,969.80 = 39,160.72/x
  3. Step 3: Cross multiply
    70,991.92x = 97,969.80 × 39,160.72
  4. Step 4: Simplify right side
    70,991.92x = 3,836,567,906.26
  5. Step 5: Solve for x
    x = 3,836,567,906.26/70,991.92
  6. Step 6: Final answer
    x = 54,042.32

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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.