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Finding the Fourth Proportional to 78,668.96, 118,020.83 and 28,749.02

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Solution

The fourth proportional to 78,668.96, 118,020.83 and 28,749.02 is: 43,129.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,668.96 : 118,020.83 = 28,749.02 : x
  2. Step 2: Convert to fraction form
    78,668.96/118,020.83 = 28,749.02/x
  3. Step 3: Cross multiply
    78,668.96x = 118,020.83 × 28,749.02
  4. Step 4: Simplify right side
    78,668.96x = 3,392,982,468.24
  5. Step 5: Solve for x
    x = 3,392,982,468.24/78,668.96
  6. Step 6: Final answer
    x = 43,129.88

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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.