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Finding the Fourth Proportional to 429.54, 643.88 and 223.98

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Solution

The fourth proportional to 429.54, 643.88 and 223.98 is: 335.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.54 : 643.88 = 223.98 : x
  2. Step 2: Convert to fraction form
    429.54/643.88 = 223.98/x
  3. Step 3: Cross multiply
    429.54x = 643.88 × 223.98
  4. Step 4: Simplify right side
    429.54x = 144,216.24
  5. Step 5: Solve for x
    x = 144,216.24/429.54
  6. Step 6: Final answer
    x = 335.75

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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.