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Finding the Fourth Proportional to 261.51, 360.90 and 191.79

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Solution

The fourth proportional to 261.51, 360.90 and 191.79 is: 264.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.51 : 360.90 = 191.79 : x
  2. Step 2: Convert to fraction form
    261.51/360.90 = 191.79/x
  3. Step 3: Cross multiply
    261.51x = 360.90 × 191.79
  4. Step 4: Simplify right side
    261.51x = 69,217.01
  5. Step 5: Solve for x
    x = 69,217.01/261.51
  6. Step 6: Final answer
    x = 264.68

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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.