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Finding the Fourth Proportional to 78,749.20, 118,123.80 and 43,319.80

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Solution

The fourth proportional to 78,749.20, 118,123.80 and 43,319.80 is: 64,979.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,749.20 : 118,123.80 = 43,319.80 : x
  2. Step 2: Convert to fraction form
    78,749.20/118,123.80 = 43,319.80/x
  3. Step 3: Cross multiply
    78,749.20x = 118,123.80 × 43,319.80
  4. Step 4: Simplify right side
    78,749.20x = 5,117,099,391.24
  5. Step 5: Solve for x
    x = 5,117,099,391.24/78,749.20
  6. Step 6: Final answer
    x = 64,979.70

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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.