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Finding the Fourth Proportional to 78,703.20, 118,285.20 and 68,565.60

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Solution

The fourth proportional to 78,703.20, 118,285.20 and 68,565.60 is: 103,049.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,703.20 : 118,285.20 = 68,565.60 : x
  2. Step 2: Convert to fraction form
    78,703.20/118,285.20 = 68,565.60/x
  3. Step 3: Cross multiply
    78,703.20x = 118,285.20 × 68,565.60
  4. Step 4: Simplify right side
    78,703.20x = 8,110,295,709.12
  5. Step 5: Solve for x
    x = 8,110,295,709.12/78,703.20
  6. Step 6: Final answer
    x = 103,049.12

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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.