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Finding the Fourth Proportional to 865.24, 1,297.84 and 215.98

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Solution

The fourth proportional to 865.24, 1,297.84 and 215.98 is: 323.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.24 : 1,297.84 = 215.98 : x
  2. Step 2: Convert to fraction form
    865.24/1,297.84 = 215.98/x
  3. Step 3: Cross multiply
    865.24x = 1,297.84 × 215.98
  4. Step 4: Simplify right side
    865.24x = 280,307.48
  5. Step 5: Solve for x
    x = 280,307.48/865.24
  6. Step 6: Final answer
    x = 323.97

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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.