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Finding the Fourth Proportional to 429.85, 644.82 and 285.25

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Solution

The fourth proportional to 429.85, 644.82 and 285.25 is: 427.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.85 : 644.82 = 285.25 : x
  2. Step 2: Convert to fraction form
    429.85/644.82 = 285.25/x
  3. Step 3: Cross multiply
    429.85x = 644.82 × 285.25
  4. Step 4: Simplify right side
    429.85x = 183,934.91
  5. Step 5: Solve for x
    x = 183,934.91/429.85
  6. Step 6: Final answer
    x = 427.90

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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.