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Finding the Fourth Proportional to 644.40, 889.50 and 534.12

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Solution

The fourth proportional to 644.40, 889.50 and 534.12 is: 737.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.40 : 889.50 = 534.12 : x
  2. Step 2: Convert to fraction form
    644.40/889.50 = 534.12/x
  3. Step 3: Cross multiply
    644.40x = 889.50 × 534.12
  4. Step 4: Simplify right side
    644.40x = 475,099.74
  5. Step 5: Solve for x
    x = 475,099.74/644.40
  6. Step 6: Final answer
    x = 737.27

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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.