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Finding the Fourth Proportional to 661.15, 991.73 and 271.08

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Solution

The fourth proportional to 661.15, 991.73 and 271.08 is: 406.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.15 : 991.73 = 271.08 : x
  2. Step 2: Convert to fraction form
    661.15/991.73 = 271.08/x
  3. Step 3: Cross multiply
    661.15x = 991.73 × 271.08
  4. Step 4: Simplify right side
    661.15x = 268,841.51
  5. Step 5: Solve for x
    x = 268,841.51/661.15
  6. Step 6: Final answer
    x = 406.63

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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.