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Finding the Fourth Proportional to 661.51, 991.45 and 552.97

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Solution

The fourth proportional to 661.51, 991.45 and 552.97 is: 828.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.51 : 991.45 = 552.97 : x
  2. Step 2: Convert to fraction form
    661.51/991.45 = 552.97/x
  3. Step 3: Cross multiply
    661.51x = 991.45 × 552.97
  4. Step 4: Simplify right side
    661.51x = 548,242.11
  5. Step 5: Solve for x
    x = 548,242.11/661.51
  6. Step 6: Final answer
    x = 828.77

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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.