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Finding the Fourth Proportional to 311.47, 429.43 and 261.87

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Solution

The fourth proportional to 311.47, 429.43 and 261.87 is: 361.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.47 : 429.43 = 261.87 : x
  2. Step 2: Convert to fraction form
    311.47/429.43 = 261.87/x
  3. Step 3: Cross multiply
    311.47x = 429.43 × 261.87
  4. Step 4: Simplify right side
    311.47x = 112,454.83
  5. Step 5: Solve for x
    x = 112,454.83/311.47
  6. Step 6: Final answer
    x = 361.05

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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.