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Finding the Fourth Proportional to 643.34, 887.81 and 348.61

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Solution

The fourth proportional to 643.34, 887.81 and 348.61 is: 481.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.34 : 887.81 = 348.61 : x
  2. Step 2: Convert to fraction form
    643.34/887.81 = 348.61/x
  3. Step 3: Cross multiply
    643.34x = 887.81 × 348.61
  4. Step 4: Simplify right side
    643.34x = 309,495.01
  5. Step 5: Solve for x
    x = 309,495.01/643.34
  6. Step 6: Final answer
    x = 481.08

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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.