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Finding the Fourth Proportional to 78,520.67, 117,736.25 and 53,590.90

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Solution

The fourth proportional to 78,520.67, 117,736.25 and 53,590.90 is: 80,355.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,520.67 : 117,736.25 = 53,590.90 : x
  2. Step 2: Convert to fraction form
    78,520.67/117,736.25 = 53,590.90/x
  3. Step 3: Cross multiply
    78,520.67x = 117,736.25 × 53,590.90
  4. Step 4: Simplify right side
    78,520.67x = 6,309,590,743.49
  5. Step 5: Solve for x
    x = 6,309,590,743.49/78,520.67
  6. Step 6: Final answer
    x = 80,355.79

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1.5x scale

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.