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Finding the Fourth Proportional to 498.81, 748.12 and 255.21

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Solution

The fourth proportional to 498.81, 748.12 and 255.21 is: 382.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.81 : 748.12 = 255.21 : x
  2. Step 2: Convert to fraction form
    498.81/748.12 = 255.21/x
  3. Step 3: Cross multiply
    498.81x = 748.12 × 255.21
  4. Step 4: Simplify right side
    498.81x = 190,927.71
  5. Step 5: Solve for x
    x = 190,927.71/498.81
  6. Step 6: Final answer
    x = 382.77

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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.