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Finding the Fourth Proportional to 68,537.81, 102,806.72 and 45,158.78

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Solution

The fourth proportional to 68,537.81, 102,806.72 and 45,158.78 is: 67,738.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,537.81 : 102,806.72 = 45,158.78 : x
  2. Step 2: Convert to fraction form
    68,537.81/102,806.72 = 45,158.78/x
  3. Step 3: Cross multiply
    68,537.81x = 102,806.72 × 45,158.78
  4. Step 4: Simplify right side
    68,537.81x = 4,642,625,311.17
  5. Step 5: Solve for x
    x = 4,642,625,311.17/68,537.81
  6. Step 6: Final answer
    x = 67,738.17

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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.