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Finding the Third Proportional to 551.81 and 621.56

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Solution

The third proportional to 551.81 and 621.56 is: 700.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.81 : 621.56 = 621.56 : x
  2. Step 2: Convert to fraction form
    551.81/621.56 = 621.56/x
  3. Step 3: Cross multiply
    551.81x = 621.56 × 621.56
  4. Step 4: Simplify right side
    551.81x = 386,339.94
  5. Step 5: Solve for x
    x = 386,339.94/551.81
  6. Step 6: Final answer
    x = 700.13

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Why These Related Problems?

These problems maintain the same ratio (1.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.