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Finding the Fourth Proportional to 644.09, 965.50 and 412.32

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Solution

The fourth proportional to 644.09, 965.50 and 412.32 is: 618.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.09 : 965.50 = 412.32 : x
  2. Step 2: Convert to fraction form
    644.09/965.50 = 412.32/x
  3. Step 3: Cross multiply
    644.09x = 965.50 × 412.32
  4. Step 4: Simplify right side
    644.09x = 398,094.96
  5. Step 5: Solve for x
    x = 398,094.96/644.09
  6. Step 6: Final answer
    x = 618.07

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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.