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Finding the Fourth Proportional to 643.06, 964.46 and 386.26

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Solution

The fourth proportional to 643.06, 964.46 and 386.26 is: 579.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.06 : 964.46 = 386.26 : x
  2. Step 2: Convert to fraction form
    643.06/964.46 = 386.26/x
  3. Step 3: Cross multiply
    643.06x = 964.46 × 386.26
  4. Step 4: Simplify right side
    643.06x = 372,532.32
  5. Step 5: Solve for x
    x = 372,532.32/643.06
  6. Step 6: Final answer
    x = 579.31

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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.