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Finding the Fourth Proportional to 551.45, 827.13 and 140.57

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Solution

The fourth proportional to 551.45, 827.13 and 140.57 is: 210.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.45 : 827.13 = 140.57 : x
  2. Step 2: Convert to fraction form
    551.45/827.13 = 140.57/x
  3. Step 3: Cross multiply
    551.45x = 827.13 × 140.57
  4. Step 4: Simplify right side
    551.45x = 116,269.66
  5. Step 5: Solve for x
    x = 116,269.66/551.45
  6. Step 6: Final answer
    x = 210.84

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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.