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Finding the Fourth Proportional to 645.26, 889.93 and 396.13

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Solution

The fourth proportional to 645.26, 889.93 and 396.13 is: 546.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.26 : 889.93 = 396.13 : x
  2. Step 2: Convert to fraction form
    645.26/889.93 = 396.13/x
  3. Step 3: Cross multiply
    645.26x = 889.93 × 396.13
  4. Step 4: Simplify right side
    645.26x = 352,526.80
  5. Step 5: Solve for x
    x = 352,526.80/645.26
  6. Step 6: Final answer
    x = 546.34

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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.