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Finding the Fourth Proportional to 91,811.70, 137,717.55 and 76,940.10

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Solution

The fourth proportional to 91,811.70, 137,717.55 and 76,940.10 is: 115,410.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,811.70 : 137,717.55 = 76,940.10 : x
  2. Step 2: Convert to fraction form
    91,811.70/137,717.55 = 76,940.10/x
  3. Step 3: Cross multiply
    91,811.70x = 137,717.55 × 76,940.10
  4. Step 4: Simplify right side
    91,811.70x = 10,596,002,068.76
  5. Step 5: Solve for x
    x = 10,596,002,068.76/91,811.70
  6. Step 6: Final answer
    x = 115,410.15

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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.