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Finding the Fourth Proportional to 70,992.81, 97,970.09 and 39,161.79

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Solution

The fourth proportional to 70,992.81, 97,970.09 and 39,161.79 is: 54,043.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,992.81 : 97,970.09 = 39,161.79 : x
  2. Step 2: Convert to fraction form
    70,992.81/97,970.09 = 39,161.79/x
  3. Step 3: Cross multiply
    70,992.81x = 97,970.09 × 39,161.79
  4. Step 4: Simplify right side
    70,992.81x = 3,836,684,090.86
  5. Step 5: Solve for x
    x = 3,836,684,090.86/70,992.81
  6. Step 6: Final answer
    x = 54,043.28

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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.