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Finding the Fourth Proportional to 118,891.20, 178,336.80 and 39,997.20

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Solution

The fourth proportional to 118,891.20, 178,336.80 and 39,997.20 is: 59,995.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,891.20 : 178,336.80 = 39,997.20 : x
  2. Step 2: Convert to fraction form
    118,891.20/178,336.80 = 39,997.20/x
  3. Step 3: Cross multiply
    118,891.20x = 178,336.80 × 39,997.20
  4. Step 4: Simplify right side
    118,891.20x = 7,132,972,656.96
  5. Step 5: Solve for x
    x = 7,132,972,656.96/118,891.20
  6. Step 6: Final answer
    x = 59,995.80

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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.