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Finding the Fourth Proportional to 142,991.20, 214,659.60 and 79,861.60

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Solution

The fourth proportional to 142,991.20, 214,659.60 and 79,861.60 is: 119,888.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,991.20 : 214,659.60 = 79,861.60 : x
  2. Step 2: Convert to fraction form
    142,991.20/214,659.60 = 79,861.60/x
  3. Step 3: Cross multiply
    142,991.20x = 214,659.60 × 79,861.60
  4. Step 4: Simplify right side
    142,991.20x = 17,143,059,111.36
  5. Step 5: Solve for x
    x = 17,143,059,111.36/142,991.20
  6. Step 6: Final answer
    x = 119,888.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.