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Finding the Fourth Proportional to 643.72, 888.32 and 348.98

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Solution

The fourth proportional to 643.72, 888.32 and 348.98 is: 481.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.72 : 888.32 = 348.98 : x
  2. Step 2: Convert to fraction form
    643.72/888.32 = 348.98/x
  3. Step 3: Cross multiply
    643.72x = 888.32 × 348.98
  4. Step 4: Simplify right side
    643.72x = 310,009.01
  5. Step 5: Solve for x
    x = 310,009.01/643.72
  6. Step 6: Final answer
    x = 481.59

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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.