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Finding the Fourth Proportional to 429.14, 643.84 and 155.36

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Solution

The fourth proportional to 429.14, 643.84 and 155.36 is: 233.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.14 : 643.84 = 155.36 : x
  2. Step 2: Convert to fraction form
    429.14/643.84 = 155.36/x
  3. Step 3: Cross multiply
    429.14x = 643.84 × 155.36
  4. Step 4: Simplify right side
    429.14x = 100,026.98
  5. Step 5: Solve for x
    x = 100,026.98/429.14
  6. Step 6: Final answer
    x = 233.09

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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.