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Finding the Fourth Proportional to 70,999.20, 97,978.68 and 39,171.60

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Solution

The fourth proportional to 70,999.20, 97,978.68 and 39,171.60 is: 54,056.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,999.20 : 97,978.68 = 39,171.60 : x
  2. Step 2: Convert to fraction form
    70,999.20/97,978.68 = 39,171.60/x
  3. Step 3: Cross multiply
    70,999.20x = 97,978.68 × 39,171.60
  4. Step 4: Simplify right side
    70,999.20x = 3,837,981,661.49
  5. Step 5: Solve for x
    x = 3,837,981,661.49/70,999.20
  6. Step 6: Final answer
    x = 54,056.69

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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.