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Finding the Fourth Proportional to 352.65, 486.39 and 312.81

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Solution

The fourth proportional to 352.65, 486.39 and 312.81 is: 431.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.65 : 486.39 = 312.81 : x
  2. Step 2: Convert to fraction form
    352.65/486.39 = 312.81/x
  3. Step 3: Cross multiply
    352.65x = 486.39 × 312.81
  4. Step 4: Simplify right side
    352.65x = 152,147.66
  5. Step 5: Solve for x
    x = 152,147.66/352.65
  6. Step 6: Final answer
    x = 431.44

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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.