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Finding the Fourth Proportional to 261.60, 361.20 and 229.20

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Solution

The fourth proportional to 261.60, 361.20 and 229.20 is: 316.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.60 : 361.20 = 229.20 : x
  2. Step 2: Convert to fraction form
    261.60/361.20 = 229.20/x
  3. Step 3: Cross multiply
    261.60x = 361.20 × 229.20
  4. Step 4: Simplify right side
    261.60x = 82,787.04
  5. Step 5: Solve for x
    x = 82,787.04/261.60
  6. Step 6: Final answer
    x = 316.46

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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.