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Finding the Fourth Proportional to 312.81, 431.25 and 303.24

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Solution

The fourth proportional to 312.81, 431.25 and 303.24 is: 418.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.81 : 431.25 = 303.24 : x
  2. Step 2: Convert to fraction form
    312.81/431.25 = 303.24/x
  3. Step 3: Cross multiply
    312.81x = 431.25 × 303.24
  4. Step 4: Simplify right side
    312.81x = 130,772.25
  5. Step 5: Solve for x
    x = 130,772.25/312.81
  6. Step 6: Final answer
    x = 418.06

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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.