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Finding the Fourth Proportional to 266,720.80, 400,081.20 and 220,640.80

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Solution

The fourth proportional to 266,720.80, 400,081.20 and 220,640.80 is: 330,961.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,720.80 : 400,081.20 = 220,640.80 : x
  2. Step 2: Convert to fraction form
    266,720.80/400,081.20 = 220,640.80/x
  3. Step 3: Cross multiply
    266,720.80x = 400,081.20 × 220,640.80
  4. Step 4: Simplify right side
    266,720.80x = 88,274,236,032.96
  5. Step 5: Solve for x
    x = 88,274,236,032.96/266,720.80
  6. Step 6: Final answer
    x = 330,961.20

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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.