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Finding the Fourth Proportional to 643.41, 888.41 and 479.39

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Solution

The fourth proportional to 643.41, 888.41 and 479.39 is: 661.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.41 : 888.41 = 479.39 : x
  2. Step 2: Convert to fraction form
    643.41/888.41 = 479.39/x
  3. Step 3: Cross multiply
    643.41x = 888.41 × 479.39
  4. Step 4: Simplify right side
    643.41x = 425,891.63
  5. Step 5: Solve for x
    x = 425,891.63/643.41
  6. Step 6: Final answer
    x = 661.93

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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.