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Finding the Fourth Proportional to 174.17, 261.18 and 128.81

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Solution

The fourth proportional to 174.17, 261.18 and 128.81 is: 193.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.17 : 261.18 = 128.81 : x
  2. Step 2: Convert to fraction form
    174.17/261.18 = 128.81/x
  3. Step 3: Cross multiply
    174.17x = 261.18 × 128.81
  4. Step 4: Simplify right side
    174.17x = 33,642.14
  5. Step 5: Solve for x
    x = 33,642.14/174.17
  6. Step 6: Final answer
    x = 193.16

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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.