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Finding the Fourth Proportional to 485.91, 729.14 and 255.33

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Solution

The fourth proportional to 485.91, 729.14 and 255.33 is: 383.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.91 : 729.14 = 255.33 : x
  2. Step 2: Convert to fraction form
    485.91/729.14 = 255.33/x
  3. Step 3: Cross multiply
    485.91x = 729.14 × 255.33
  4. Step 4: Simplify right side
    485.91x = 186,170.04
  5. Step 5: Solve for x
    x = 186,170.04/485.91
  6. Step 6: Final answer
    x = 383.14

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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.