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Finding the Fourth Proportional to 661.03, 991.55 and 276.28

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Solution

The fourth proportional to 661.03, 991.55 and 276.28 is: 414.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.03 : 991.55 = 276.28 : x
  2. Step 2: Convert to fraction form
    661.03/991.55 = 276.28/x
  3. Step 3: Cross multiply
    661.03x = 991.55 × 276.28
  4. Step 4: Simplify right side
    661.03x = 273,945.81
  5. Step 5: Solve for x
    x = 273,945.81/661.03
  6. Step 6: Final answer
    x = 414.42

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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.