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Finding the Fourth Proportional to 643.30, 887.75 and 348.57

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Solution

The fourth proportional to 643.30, 887.75 and 348.57 is: 481.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.30 : 887.75 = 348.57 : x
  2. Step 2: Convert to fraction form
    643.30/887.75 = 348.57/x
  3. Step 3: Cross multiply
    643.30x = 887.75 × 348.57
  4. Step 4: Simplify right side
    643.30x = 309,442.44
  5. Step 5: Solve for x
    x = 309,442.44/643.30
  6. Step 6: Final answer
    x = 481.02

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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.