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Finding the Fourth Proportional to 489.72, 675.90 and 303.18

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Solution

The fourth proportional to 489.72, 675.90 and 303.18 is: 418.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.72 : 675.90 = 303.18 : x
  2. Step 2: Convert to fraction form
    489.72/675.90 = 303.18/x
  3. Step 3: Cross multiply
    489.72x = 675.90 × 303.18
  4. Step 4: Simplify right side
    489.72x = 204,919.36
  5. Step 5: Solve for x
    x = 204,919.36/489.72
  6. Step 6: Final answer
    x = 418.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.