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Finding the Fourth Proportional to 311.42, 464.93 and 285.50

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Solution

The fourth proportional to 311.42, 464.93 and 285.50 is: 426.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.42 : 464.93 = 285.50 : x
  2. Step 2: Convert to fraction form
    311.42/464.93 = 285.50/x
  3. Step 3: Cross multiply
    311.42x = 464.93 × 285.50
  4. Step 4: Simplify right side
    311.42x = 132,733.76
  5. Step 5: Solve for x
    x = 132,733.76/311.42
  6. Step 6: Final answer
    x = 426.23

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.