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Finding the Fourth Proportional to 81,336.30, 122,004.45 and 74,078.70

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Solution

The fourth proportional to 81,336.30, 122,004.45 and 74,078.70 is: 111,118.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,336.30 : 122,004.45 = 74,078.70 : x
  2. Step 2: Convert to fraction form
    81,336.30/122,004.45 = 74,078.70/x
  3. Step 3: Cross multiply
    81,336.30x = 122,004.45 × 74,078.70
  4. Step 4: Simplify right side
    81,336.30x = 9,037,931,050.22
  5. Step 5: Solve for x
    x = 9,037,931,050.22/81,336.30
  6. Step 6: Final answer
    x = 111,118.05

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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.