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Finding the Fourth Proportional to 261.76, 360.74 and 242.20

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Solution

The fourth proportional to 261.76, 360.74 and 242.20 is: 333.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.76 : 360.74 = 242.20 : x
  2. Step 2: Convert to fraction form
    261.76/360.74 = 242.20/x
  3. Step 3: Cross multiply
    261.76x = 360.74 × 242.20
  4. Step 4: Simplify right side
    261.76x = 87,371.23
  5. Step 5: Solve for x
    x = 87,371.23/261.76
  6. Step 6: Final answer
    x = 333.78

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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.