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Finding the Fourth Proportional to 85,151.70, 127,727.55 and 76,857.30

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Solution

The fourth proportional to 85,151.70, 127,727.55 and 76,857.30 is: 115,285.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,151.70 : 127,727.55 = 76,857.30 : x
  2. Step 2: Convert to fraction form
    85,151.70/127,727.55 = 76,857.30/x
  3. Step 3: Cross multiply
    85,151.70x = 127,727.55 × 76,857.30
  4. Step 4: Simplify right side
    85,151.70x = 9,816,794,628.62
  5. Step 5: Solve for x
    x = 9,816,794,628.62/85,151.70
  6. Step 6: Final answer
    x = 115,285.95

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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.