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Finding the Fourth Proportional to 91,396.89, 136,900.94 and 53,916.57

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Solution

The fourth proportional to 91,396.89, 136,900.94 and 53,916.57 is: 80,760.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,396.89 : 136,900.94 = 53,916.57 : x
  2. Step 2: Convert to fraction form
    91,396.89/136,900.94 = 53,916.57/x
  3. Step 3: Cross multiply
    91,396.89x = 136,900.94 × 53,916.57
  4. Step 4: Simplify right side
    91,396.89x = 7,381,228,844.99
  5. Step 5: Solve for x
    x = 7,381,228,844.99/91,396.89
  6. Step 6: Final answer
    x = 80,760.18

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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.