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Finding the Fourth Proportional to 643.36, 964.77 and 247.81

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Solution

The fourth proportional to 643.36, 964.77 and 247.81 is: 371.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.36 : 964.77 = 247.81 : x
  2. Step 2: Convert to fraction form
    643.36/964.77 = 247.81/x
  3. Step 3: Cross multiply
    643.36x = 964.77 × 247.81
  4. Step 4: Simplify right side
    643.36x = 239,079.65
  5. Step 5: Solve for x
    x = 239,079.65/643.36
  6. Step 6: Final answer
    x = 371.61

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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.