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Finding the Fourth Proportional to 312.53, 433.28 and 305.24

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Solution

The fourth proportional to 312.53, 433.28 and 305.24 is: 423.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.53 : 433.28 = 305.24 : x
  2. Step 2: Convert to fraction form
    312.53/433.28 = 305.24/x
  3. Step 3: Cross multiply
    312.53x = 433.28 × 305.24
  4. Step 4: Simplify right side
    312.53x = 132,252.98
  5. Step 5: Solve for x
    x = 132,252.98/312.53
  6. Step 6: Final answer
    x = 423.18

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.