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Finding the Fourth Proportional to 644.94, 890.87 and 494.64

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Solution

The fourth proportional to 644.94, 890.87 and 494.64 is: 683.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.94 : 890.87 = 494.64 : x
  2. Step 2: Convert to fraction form
    644.94/890.87 = 494.64/x
  3. Step 3: Cross multiply
    644.94x = 890.87 × 494.64
  4. Step 4: Simplify right side
    644.94x = 440,657.46
  5. Step 5: Solve for x
    x = 440,657.46/644.94
  6. Step 6: Final answer
    x = 683.25

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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.