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Finding the Fourth Proportional to 864.15, 1,296.22 and 214.88

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Solution

The fourth proportional to 864.15, 1,296.22 and 214.88 is: 322.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.15 : 1,296.22 = 214.88 : x
  2. Step 2: Convert to fraction form
    864.15/1,296.22 = 214.88/x
  3. Step 3: Cross multiply
    864.15x = 1,296.22 × 214.88
  4. Step 4: Simplify right side
    864.15x = 278,530.44
  5. Step 5: Solve for x
    x = 278,530.44/864.15
  6. Step 6: Final answer
    x = 322.32

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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.