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Finding the Fourth Proportional to 429.36, 643.69 and 212.82

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Solution

The fourth proportional to 429.36, 643.69 and 212.82 is: 319.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.36 : 643.69 = 212.82 : x
  2. Step 2: Convert to fraction form
    429.36/643.69 = 212.82/x
  3. Step 3: Cross multiply
    429.36x = 643.69 × 212.82
  4. Step 4: Simplify right side
    429.36x = 136,990.11
  5. Step 5: Solve for x
    x = 136,990.11/429.36
  6. Step 6: Final answer
    x = 319.06

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