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Finding the Fourth Proportional to 865.15, 1,297.94 and 338.06

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Solution

The fourth proportional to 865.15, 1,297.94 and 338.06 is: 507.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.15 : 1,297.94 = 338.06 : x
  2. Step 2: Convert to fraction form
    865.15/1,297.94 = 338.06/x
  3. Step 3: Cross multiply
    865.15x = 1,297.94 × 338.06
  4. Step 4: Simplify right side
    865.15x = 438,785.69
  5. Step 5: Solve for x
    x = 438,785.69/865.15
  6. Step 6: Final answer
    x = 507.18

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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.