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Finding the Fourth Proportional to 810.21, 1,215.79 and 341.66

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Solution

The fourth proportional to 810.21, 1,215.79 and 341.66 is: 512.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.21 : 1,215.79 = 341.66 : x
  2. Step 2: Convert to fraction form
    810.21/1,215.79 = 341.66/x
  3. Step 3: Cross multiply
    810.21x = 1,215.79 × 341.66
  4. Step 4: Simplify right side
    810.21x = 415,383.29
  5. Step 5: Solve for x
    x = 415,383.29/810.21
  6. Step 6: Final answer
    x = 512.68

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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.