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Finding the Fourth Proportional to 429.94, 644.92 and 285.64

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Solution

The fourth proportional to 429.94, 644.92 and 285.64 is: 428.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.94 : 644.92 = 285.64 : x
  2. Step 2: Convert to fraction form
    429.94/644.92 = 285.64/x
  3. Step 3: Cross multiply
    429.94x = 644.92 × 285.64
  4. Step 4: Simplify right side
    429.94x = 184,214.95
  5. Step 5: Solve for x
    x = 184,214.95/429.94
  6. Step 6: Final answer
    x = 428.47

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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.