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Finding the Fourth Proportional to 865.81, 1,297.75 and 345.68

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Solution

The fourth proportional to 865.81, 1,297.75 and 345.68 is: 518.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.81 : 1,297.75 = 345.68 : x
  2. Step 2: Convert to fraction form
    865.81/1,297.75 = 345.68/x
  3. Step 3: Cross multiply
    865.81x = 1,297.75 × 345.68
  4. Step 4: Simplify right side
    865.81x = 448,606.22
  5. Step 5: Solve for x
    x = 448,606.22/865.81
  6. Step 6: Final answer
    x = 518.13

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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.