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Finding the Fourth Proportional to 261.24, 360.36 and 212.16

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Solution

The fourth proportional to 261.24, 360.36 and 212.16 is: 292.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.24 : 360.36 = 212.16 : x
  2. Step 2: Convert to fraction form
    261.24/360.36 = 212.16/x
  3. Step 3: Cross multiply
    261.24x = 360.36 × 212.16
  4. Step 4: Simplify right side
    261.24x = 76,453.98
  5. Step 5: Solve for x
    x = 76,453.98/261.24
  6. Step 6: Final answer
    x = 292.66

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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.