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Finding the Fourth Proportional to 651.42, 977.16 and 218.64

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Solution

The fourth proportional to 651.42, 977.16 and 218.64 is: 327.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.42 : 977.16 = 218.64 : x
  2. Step 2: Convert to fraction form
    651.42/977.16 = 218.64/x
  3. Step 3: Cross multiply
    651.42x = 977.16 × 218.64
  4. Step 4: Simplify right side
    651.42x = 213,646.26
  5. Step 5: Solve for x
    x = 213,646.26/651.42
  6. Step 6: Final answer
    x = 327.97

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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.