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Finding the Fourth Proportional to 312.15, 432.54 and 304.97

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Solution

The fourth proportional to 312.15, 432.54 and 304.97 is: 422.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.15 : 432.54 = 304.97 : x
  2. Step 2: Convert to fraction form
    312.15/432.54 = 304.97/x
  3. Step 3: Cross multiply
    312.15x = 432.54 × 304.97
  4. Step 4: Simplify right side
    312.15x = 131,911.72
  5. Step 5: Solve for x
    x = 131,911.72/312.15
  6. Step 6: Final answer
    x = 422.59

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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.