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Finding the Fourth Proportional to 429.33, 643.42 and 223.47

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Solution

The fourth proportional to 429.33, 643.42 and 223.47 is: 334.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.33 : 643.42 = 223.47 : x
  2. Step 2: Convert to fraction form
    429.33/643.42 = 223.47/x
  3. Step 3: Cross multiply
    429.33x = 643.42 × 223.47
  4. Step 4: Simplify right side
    429.33x = 143,785.07
  5. Step 5: Solve for x
    x = 143,785.07/429.33
  6. Step 6: Final answer
    x = 334.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.