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Finding the Fourth Proportional to 78,747.72, 118,086.95 and 28,814.87

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Solution

The fourth proportional to 78,747.72, 118,086.95 and 28,814.87 is: 43,209.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,747.72 : 118,086.95 = 28,814.87 : x
  2. Step 2: Convert to fraction form
    78,747.72/118,086.95 = 28,814.87/x
  3. Step 3: Cross multiply
    78,747.72x = 118,086.95 × 28,814.87
  4. Step 4: Simplify right side
    78,747.72x = 3,402,659,378.44
  5. Step 5: Solve for x
    x = 3,402,659,378.44/78,747.72
  6. Step 6: Final answer
    x = 43,209.62

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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.