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Finding the Fourth Proportional to 628.48, 867.31 and 348.72

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Solution

The fourth proportional to 628.48, 867.31 and 348.72 is: 481.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.48 : 867.31 = 348.72 : x
  2. Step 2: Convert to fraction form
    628.48/867.31 = 348.72/x
  3. Step 3: Cross multiply
    628.48x = 867.31 × 348.72
  4. Step 4: Simplify right side
    628.48x = 302,448.34
  5. Step 5: Solve for x
    x = 302,448.34/628.48
  6. Step 6: Final answer
    x = 481.24

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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.