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Finding the Fourth Proportional to 643.69, 888.28 and 348.95

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Solution

The fourth proportional to 643.69, 888.28 and 348.95 is: 481.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.69 : 888.28 = 348.95 : x
  2. Step 2: Convert to fraction form
    643.69/888.28 = 348.95/x
  3. Step 3: Cross multiply
    643.69x = 888.28 × 348.95
  4. Step 4: Simplify right side
    643.69x = 309,963.56
  5. Step 5: Solve for x
    x = 309,963.56/643.69
  6. Step 6: Final answer
    x = 481.55

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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.