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Finding the Fourth Proportional to 78,709.70, 118,059.15 and 25,400.90

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Solution

The fourth proportional to 78,709.70, 118,059.15 and 25,400.90 is: 38,099.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,709.70 : 118,059.15 = 25,400.90 : x
  2. Step 2: Convert to fraction form
    78,709.70/118,059.15 = 25,400.90/x
  3. Step 3: Cross multiply
    78,709.70x = 118,059.15 × 25,400.90
  4. Step 4: Simplify right side
    78,709.70x = 2,998,808,663.24
  5. Step 5: Solve for x
    x = 2,998,808,663.24/78,709.70
  6. Step 6: Final answer
    x = 38,099.61

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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.