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Finding the Fourth Proportional to 312.08, 429.72 and 262.86

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Solution

The fourth proportional to 312.08, 429.72 and 262.86 is: 361.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.08 : 429.72 = 262.86 : x
  2. Step 2: Convert to fraction form
    312.08/429.72 = 262.86/x
  3. Step 3: Cross multiply
    312.08x = 429.72 × 262.86
  4. Step 4: Simplify right side
    312.08x = 112,956.20
  5. Step 5: Solve for x
    x = 112,956.20/312.08
  6. Step 6: Final answer
    x = 361.95

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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.