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Finding the Fourth Proportional to 661.40, 992.16 and 271.38

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Solution

The fourth proportional to 661.40, 992.16 and 271.38 is: 407.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.40 : 992.16 = 271.38 : x
  2. Step 2: Convert to fraction form
    661.40/992.16 = 271.38/x
  3. Step 3: Cross multiply
    661.40x = 992.16 × 271.38
  4. Step 4: Simplify right side
    661.40x = 269,252.38
  5. Step 5: Solve for x
    x = 269,252.38/661.40
  6. Step 6: Final answer
    x = 407.09

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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.