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Finding the Fourth Proportional to 91,766.80, 137,736.60 and 56,774.80

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Solution

The fourth proportional to 91,766.80, 137,736.60 and 56,774.80 is: 85,215.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,766.80 : 137,736.60 = 56,774.80 : x
  2. Step 2: Convert to fraction form
    91,766.80/137,736.60 = 56,774.80/x
  3. Step 3: Cross multiply
    91,766.80x = 137,736.60 × 56,774.80
  4. Step 4: Simplify right side
    91,766.80x = 7,819,967,917.68
  5. Step 5: Solve for x
    x = 7,819,967,917.68/91,766.80
  6. Step 6: Final answer
    x = 85,215.65

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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.