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Finding the Fourth Proportional to 644.85, 888.98 and 423.72

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Solution

The fourth proportional to 644.85, 888.98 and 423.72 is: 584.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.85 : 888.98 = 423.72 : x
  2. Step 2: Convert to fraction form
    644.85/888.98 = 423.72/x
  3. Step 3: Cross multiply
    644.85x = 888.98 × 423.72
  4. Step 4: Simplify right side
    644.85x = 376,676.49
  5. Step 5: Solve for x
    x = 376,676.49/644.85
  6. Step 6: Final answer
    x = 584.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.