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Finding the Fourth Proportional to 429.63, 644.73 and 186.18

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Solution

The fourth proportional to 429.63, 644.73 and 186.18 is: 279.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.63 : 644.73 = 186.18 : x
  2. Step 2: Convert to fraction form
    429.63/644.73 = 186.18/x
  3. Step 3: Cross multiply
    429.63x = 644.73 × 186.18
  4. Step 4: Simplify right side
    429.63x = 120,035.83
  5. Step 5: Solve for x
    x = 120,035.83/429.63
  6. Step 6: Final answer
    x = 279.39

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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.