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Finding the Fourth Proportional to 810.89, 1,215.67 and 323.47

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Solution

The fourth proportional to 810.89, 1,215.67 and 323.47 is: 484.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.89 : 1,215.67 = 323.47 : x
  2. Step 2: Convert to fraction form
    810.89/1,215.67 = 323.47/x
  3. Step 3: Cross multiply
    810.89x = 1,215.67 × 323.47
  4. Step 4: Simplify right side
    810.89x = 393,232.77
  5. Step 5: Solve for x
    x = 393,232.77/810.89
  6. Step 6: Final answer
    x = 484.94

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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.