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Finding the Fourth Proportional to 810.99, 1,215.54 and 323.37

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Solution

The fourth proportional to 810.99, 1,215.54 and 323.37 is: 484.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.99 : 1,215.54 = 323.37 : x
  2. Step 2: Convert to fraction form
    810.99/1,215.54 = 323.37/x
  3. Step 3: Cross multiply
    810.99x = 1,215.54 × 323.37
  4. Step 4: Simplify right side
    810.99x = 393,069.17
  5. Step 5: Solve for x
    x = 393,069.17/810.99
  6. Step 6: Final answer
    x = 484.68

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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.