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Finding the Fourth Proportional to 76,936.60, 115,404.90 and 72,659.80

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Solution

The fourth proportional to 76,936.60, 115,404.90 and 72,659.80 is: 108,989.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,936.60 : 115,404.90 = 72,659.80 : x
  2. Step 2: Convert to fraction form
    76,936.60/115,404.90 = 72,659.80/x
  3. Step 3: Cross multiply
    76,936.60x = 115,404.90 × 72,659.80
  4. Step 4: Simplify right side
    76,936.60x = 8,385,296,953.02
  5. Step 5: Solve for x
    x = 8,385,296,953.02/76,936.60
  6. Step 6: Final answer
    x = 108,989.70

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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.