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Finding the Fourth Proportional to 651.39, 977.07 and 218.55

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Solution

The fourth proportional to 651.39, 977.07 and 218.55 is: 327.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.39 : 977.07 = 218.55 : x
  2. Step 2: Convert to fraction form
    651.39/977.07 = 218.55/x
  3. Step 3: Cross multiply
    651.39x = 977.07 × 218.55
  4. Step 4: Simplify right side
    651.39x = 213,538.65
  5. Step 5: Solve for x
    x = 213,538.65/651.39
  6. Step 6: Final answer
    x = 327.82

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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.