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Finding the Fourth Proportional to 661.36, 993.17 and 551.56

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Solution

The fourth proportional to 661.36, 993.17 and 551.56 is: 828.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.36 : 993.17 = 551.56 : x
  2. Step 2: Convert to fraction form
    661.36/993.17 = 551.56/x
  3. Step 3: Cross multiply
    661.36x = 993.17 × 551.56
  4. Step 4: Simplify right side
    661.36x = 547,790.09
  5. Step 5: Solve for x
    x = 547,790.09/661.36
  6. Step 6: Final answer
    x = 828.28

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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.