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Finding the Fourth Proportional to 628.17, 866.87 and 348.39

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Solution

The fourth proportional to 628.17, 866.87 and 348.39 is: 480.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.17 : 866.87 = 348.39 : x
  2. Step 2: Convert to fraction form
    628.17/866.87 = 348.39/x
  3. Step 3: Cross multiply
    628.17x = 866.87 × 348.39
  4. Step 4: Simplify right side
    628.17x = 302,010.68
  5. Step 5: Solve for x
    x = 302,010.68/628.17
  6. Step 6: Final answer
    x = 480.78

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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.