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Finding the Fourth Proportional to 865.15, 1,297.91 and 338.15

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Solution

The fourth proportional to 865.15, 1,297.91 and 338.15 is: 507.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.15 : 1,297.91 = 338.15 : x
  2. Step 2: Convert to fraction form
    865.15/1,297.91 = 338.15/x
  3. Step 3: Cross multiply
    865.15x = 1,297.91 × 338.15
  4. Step 4: Simplify right side
    865.15x = 438,892.36
  5. Step 5: Solve for x
    x = 438,892.36/865.15
  6. Step 6: Final answer
    x = 507.30

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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.