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Finding the Fourth Proportional to 643.94, 888.63 and 349.20

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Solution

The fourth proportional to 643.94, 888.63 and 349.20 is: 481.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.94 : 888.63 = 349.20 : x
  2. Step 2: Convert to fraction form
    643.94/888.63 = 349.20/x
  3. Step 3: Cross multiply
    643.94x = 888.63 × 349.20
  4. Step 4: Simplify right side
    643.94x = 310,312.93
  5. Step 5: Solve for x
    x = 310,312.93/643.94
  6. Step 6: Final answer
    x = 481.90

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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.