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Finding the Fourth Proportional to 644.52, 889.40 and 364.80

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Solution

The fourth proportional to 644.52, 889.40 and 364.80 is: 503.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.52 : 889.40 = 364.80 : x
  2. Step 2: Convert to fraction form
    644.52/889.40 = 364.80/x
  3. Step 3: Cross multiply
    644.52x = 889.40 × 364.80
  4. Step 4: Simplify right side
    644.52x = 324,453.12
  5. Step 5: Solve for x
    x = 324,453.12/644.52
  6. Step 6: Final answer
    x = 503.40

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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.