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Finding the Fourth Proportional to 76,912.20, 115,368.30 and 68,099.40

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Solution

The fourth proportional to 76,912.20, 115,368.30 and 68,099.40 is: 102,149.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,912.20 : 115,368.30 = 68,099.40 : x
  2. Step 2: Convert to fraction form
    76,912.20/115,368.30 = 68,099.40/x
  3. Step 3: Cross multiply
    76,912.20x = 115,368.30 × 68,099.40
  4. Step 4: Simplify right side
    76,912.20x = 7,856,512,009.02
  5. Step 5: Solve for x
    x = 7,856,512,009.02/76,912.20
  6. Step 6: Final answer
    x = 102,149.10

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1.5x scale

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.