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Finding the Fourth Proportional to 864.42, 1,296.66 and 215.16

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Solution

The fourth proportional to 864.42, 1,296.66 and 215.16 is: 322.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.42 : 1,296.66 = 215.16 : x
  2. Step 2: Convert to fraction form
    864.42/1,296.66 = 215.16/x
  3. Step 3: Cross multiply
    864.42x = 1,296.66 × 215.16
  4. Step 4: Simplify right side
    864.42x = 278,984.10
  5. Step 5: Solve for x
    x = 278,984.10/864.42
  6. Step 6: Final answer
    x = 322.74

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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.