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Finding the Fourth Proportional to 261.11, 360.38 and 156.22

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Solution

The fourth proportional to 261.11, 360.38 and 156.22 is: 215.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.11 : 360.38 = 156.22 : x
  2. Step 2: Convert to fraction form
    261.11/360.38 = 156.22/x
  3. Step 3: Cross multiply
    261.11x = 360.38 × 156.22
  4. Step 4: Simplify right side
    261.11x = 56,298.56
  5. Step 5: Solve for x
    x = 56,298.56/261.11
  6. Step 6: Final answer
    x = 215.61

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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.