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Finding the Fourth Proportional to 209,896.20, 314,844.30 and 76,780.80

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Solution

The fourth proportional to 209,896.20, 314,844.30 and 76,780.80 is: 115,171.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,896.20 : 314,844.30 = 76,780.80 : x
  2. Step 2: Convert to fraction form
    209,896.20/314,844.30 = 76,780.80/x
  3. Step 3: Cross multiply
    209,896.20x = 314,844.30 × 76,780.80
  4. Step 4: Simplify right side
    209,896.20x = 24,173,997,229.44
  5. Step 5: Solve for x
    x = 24,173,997,229.44/209,896.20
  6. Step 6: Final answer
    x = 115,171.20

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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.