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Finding the Fourth Proportional to 352.22, 486.29 and 315.31

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Solution

The fourth proportional to 352.22, 486.29 and 315.31 is: 435.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.22 : 486.29 = 315.31 : x
  2. Step 2: Convert to fraction form
    352.22/486.29 = 315.31/x
  3. Step 3: Cross multiply
    352.22x = 486.29 × 315.31
  4. Step 4: Simplify right side
    352.22x = 153,330.52
  5. Step 5: Solve for x
    x = 153,330.52/352.22
  6. Step 6: Final answer
    x = 435.33

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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.