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Finding the Fourth Proportional to 810.23, 1,215.34 and 439.97

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Solution

The fourth proportional to 810.23, 1,215.34 and 439.97 is: 659.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.23 : 1,215.34 = 439.97 : x
  2. Step 2: Convert to fraction form
    810.23/1,215.34 = 439.97/x
  3. Step 3: Cross multiply
    810.23x = 1,215.34 × 439.97
  4. Step 4: Simplify right side
    810.23x = 534,705.96
  5. Step 5: Solve for x
    x = 534,705.96/810.23
  6. Step 6: Final answer
    x = 659.95

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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.