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Finding the Fourth Proportional to 651.25, 976.98 and 218.51

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Solution

The fourth proportional to 651.25, 976.98 and 218.51 is: 327.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.25 : 976.98 = 218.51 : x
  2. Step 2: Convert to fraction form
    651.25/976.98 = 218.51/x
  3. Step 3: Cross multiply
    651.25x = 976.98 × 218.51
  4. Step 4: Simplify right side
    651.25x = 213,479.90
  5. Step 5: Solve for x
    x = 213,479.90/651.25
  6. Step 6: Final answer
    x = 327.80

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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.