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Finding the Fourth Proportional to 865.04, 1,297.55 and 215.78

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Solution

The fourth proportional to 865.04, 1,297.55 and 215.78 is: 323.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.04 : 1,297.55 = 215.78 : x
  2. Step 2: Convert to fraction form
    865.04/1,297.55 = 215.78/x
  3. Step 3: Cross multiply
    865.04x = 1,297.55 × 215.78
  4. Step 4: Simplify right side
    865.04x = 279,979.39
  5. Step 5: Solve for x
    x = 279,979.39/865.04
  6. Step 6: Final answer
    x = 323.66

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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.