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Finding the Fourth Proportional to 177.81, 266.40 and 81.42

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Solution

The fourth proportional to 177.81, 266.40 and 81.42 is: 121.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.81 : 266.40 = 81.42 : x
  2. Step 2: Convert to fraction form
    177.81/266.40 = 81.42/x
  3. Step 3: Cross multiply
    177.81x = 266.40 × 81.42
  4. Step 4: Simplify right side
    177.81x = 21,690.29
  5. Step 5: Solve for x
    x = 21,690.29/177.81
  6. Step 6: Final answer
    x = 121.99

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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.