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Finding the Fourth Proportional to 865.69, 1,298.56 and 216.42

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Solution

The fourth proportional to 865.69, 1,298.56 and 216.42 is: 324.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.69 : 1,298.56 = 216.42 : x
  2. Step 2: Convert to fraction form
    865.69/1,298.56 = 216.42/x
  3. Step 3: Cross multiply
    865.69x = 1,298.56 × 216.42
  4. Step 4: Simplify right side
    865.69x = 281,036.05
  5. Step 5: Solve for x
    x = 281,036.05/865.69
  6. Step 6: Final answer
    x = 324.64

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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.