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Finding the Fourth Proportional to 395.33, 544.98 and 312.31

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Solution

The fourth proportional to 395.33, 544.98 and 312.31 is: 430.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.33 : 544.98 = 312.31 : x
  2. Step 2: Convert to fraction form
    395.33/544.98 = 312.31/x
  3. Step 3: Cross multiply
    395.33x = 544.98 × 312.31
  4. Step 4: Simplify right side
    395.33x = 170,198.42
  5. Step 5: Solve for x
    x = 170,198.42/395.33
  6. Step 6: Final answer
    x = 430.52

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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.