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Finding the Fourth Proportional to 429.44, 643.77 and 155.34

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Solution

The fourth proportional to 429.44, 643.77 and 155.34 is: 232.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.44 : 643.77 = 155.34 : x
  2. Step 2: Convert to fraction form
    429.44/643.77 = 155.34/x
  3. Step 3: Cross multiply
    429.44x = 643.77 × 155.34
  4. Step 4: Simplify right side
    429.44x = 100,003.23
  5. Step 5: Solve for x
    x = 100,003.23/429.44
  6. Step 6: Final answer
    x = 232.87

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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.