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Finding the Fourth Proportional to 865.81, 1,298.69 and 216.55

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Solution

The fourth proportional to 865.81, 1,298.69 and 216.55 is: 324.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.81 : 1,298.69 = 216.55 : x
  2. Step 2: Convert to fraction form
    865.81/1,298.69 = 216.55/x
  3. Step 3: Cross multiply
    865.81x = 1,298.69 × 216.55
  4. Step 4: Simplify right side
    865.81x = 281,224.83
  5. Step 5: Solve for x
    x = 281,224.83/865.81
  6. Step 6: Final answer
    x = 324.81

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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.