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Finding the Fourth Proportional to 1,211.44, 1,817.24 and 517.72

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Solution

The fourth proportional to 1,211.44, 1,817.24 and 517.72 is: 776.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.44 : 1,817.24 = 517.72 : x
  2. Step 2: Convert to fraction form
    1,211.44/1,817.24 = 517.72/x
  3. Step 3: Cross multiply
    1,211.44x = 1,817.24 × 517.72
  4. Step 4: Simplify right side
    1,211.44x = 940,821.49
  5. Step 5: Solve for x
    x = 940,821.49/1,211.44
  6. Step 6: Final answer
    x = 776.61

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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.