Home / 142,121.27-196,122.21-78,457.70

Finding the Fourth Proportional to 142,121.27, 196,122.21 and 78,457.70

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Solution

The fourth proportional to 142,121.27, 196,122.21 and 78,457.70 is: 108,268.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,121.27 : 196,122.21 = 78,457.70 : x
  2. Step 2: Convert to fraction form
    142,121.27/196,122.21 = 78,457.70/x
  3. Step 3: Cross multiply
    142,121.27x = 196,122.21 × 78,457.70
  4. Step 4: Simplify right side
    142,121.27x = 15,387,296,142.62
  5. Step 5: Solve for x
    x = 15,387,296,142.62/142,121.27
  6. Step 6: Final answer
    x = 108,268.78

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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.