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Finding the Fourth Proportional to 643.57, 888.13 and 348.84

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Solution

The fourth proportional to 643.57, 888.13 and 348.84 is: 481.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.57 : 888.13 = 348.84 : x
  2. Step 2: Convert to fraction form
    643.57/888.13 = 348.84/x
  3. Step 3: Cross multiply
    643.57x = 888.13 × 348.84
  4. Step 4: Simplify right side
    643.57x = 309,812.36
  5. Step 5: Solve for x
    x = 309,812.36/643.57
  6. Step 6: Final answer
    x = 481.40

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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.