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Finding the Fourth Proportional to 91,079.80, 136,619.70 and 61,336.60

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Solution

The fourth proportional to 91,079.80, 136,619.70 and 61,336.60 is: 92,004.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,079.80 : 136,619.70 = 61,336.60 : x
  2. Step 2: Convert to fraction form
    91,079.80/136,619.70 = 61,336.60/x
  3. Step 3: Cross multiply
    91,079.80x = 136,619.70 × 61,336.60
  4. Step 4: Simplify right side
    91,079.80x = 8,379,787,891.02
  5. Step 5: Solve for x
    x = 8,379,787,891.02/91,079.80
  6. Step 6: Final answer
    x = 92,004.90

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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.