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Finding the Fourth Proportional to 810.22, 1,215.49 and 262.26

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Solution

The fourth proportional to 810.22, 1,215.49 and 262.26 is: 393.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.22 : 1,215.49 = 262.26 : x
  2. Step 2: Convert to fraction form
    810.22/1,215.49 = 262.26/x
  3. Step 3: Cross multiply
    810.22x = 1,215.49 × 262.26
  4. Step 4: Simplify right side
    810.22x = 318,767.02
  5. Step 5: Solve for x
    x = 318,767.02/810.22
  6. Step 6: Final answer
    x = 393.43

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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.