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Finding the Fourth Proportional to 91,894.99, 137,861.60 and 28,712.56

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Solution

The fourth proportional to 91,894.99, 137,861.60 and 28,712.56 is: 43,074.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,894.99 : 137,861.60 = 28,712.56 : x
  2. Step 2: Convert to fraction form
    91,894.99/137,861.60 = 28,712.56/x
  3. Step 3: Cross multiply
    91,894.99x = 137,861.60 × 28,712.56
  4. Step 4: Simplify right side
    91,894.99x = 3,958,359,461.70
  5. Step 5: Solve for x
    x = 3,958,359,461.70/91,894.99
  6. Step 6: Final answer
    x = 43,074.81

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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.