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Finding the Fourth Proportional to 643.30, 887.77 and 348.58

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Solution

The fourth proportional to 643.30, 887.77 and 348.58 is: 481.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.30 : 887.77 = 348.58 : x
  2. Step 2: Convert to fraction form
    643.30/887.77 = 348.58/x
  3. Step 3: Cross multiply
    643.30x = 887.77 × 348.58
  4. Step 4: Simplify right side
    643.30x = 309,458.87
  5. Step 5: Solve for x
    x = 309,458.87/643.30
  6. Step 6: Final answer
    x = 481.05

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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.