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Finding the Fourth Proportional to 261.19, 360.30 and 171.40

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Solution

The fourth proportional to 261.19, 360.30 and 171.40 is: 236.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.19 : 360.30 = 171.40 : x
  2. Step 2: Convert to fraction form
    261.19/360.30 = 171.40/x
  3. Step 3: Cross multiply
    261.19x = 360.30 × 171.40
  4. Step 4: Simplify right side
    261.19x = 61,755.42
  5. Step 5: Solve for x
    x = 61,755.42/261.19
  6. Step 6: Final answer
    x = 236.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.