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Finding the Fourth Proportional to 91,172.94, 136,806.78 and 68,979.74

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Solution

The fourth proportional to 91,172.94, 136,806.78 and 68,979.74 is: 103,505.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,172.94 : 136,806.78 = 68,979.74 : x
  2. Step 2: Convert to fraction form
    91,172.94/136,806.78 = 68,979.74/x
  3. Step 3: Cross multiply
    91,172.94x = 136,806.78 × 68,979.74
  4. Step 4: Simplify right side
    91,172.94x = 9,436,896,114.64
  5. Step 5: Solve for x
    x = 9,436,896,114.64/91,172.94
  6. Step 6: Final answer
    x = 103,505.45

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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.