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Finding the Fourth Proportional to 643.61, 888.18 and 348.88

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Solution

The fourth proportional to 643.61, 888.18 and 348.88 is: 481.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.61 : 888.18 = 348.88 : x
  2. Step 2: Convert to fraction form
    643.61/888.18 = 348.88/x
  3. Step 3: Cross multiply
    643.61x = 888.18 × 348.88
  4. Step 4: Simplify right side
    643.61x = 309,866.02
  5. Step 5: Solve for x
    x = 309,866.02/643.61
  6. Step 6: Final answer
    x = 481.45

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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.