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Finding the Fourth Proportional to 489.81, 675.85 and 303.30

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Solution

The fourth proportional to 489.81, 675.85 and 303.30 is: 418.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.81 : 675.85 = 303.30 : x
  2. Step 2: Convert to fraction form
    489.81/675.85 = 303.30/x
  3. Step 3: Cross multiply
    489.81x = 675.85 × 303.30
  4. Step 4: Simplify right side
    489.81x = 204,985.31
  5. Step 5: Solve for x
    x = 204,985.31/489.81
  6. Step 6: Final answer
    x = 418.50

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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.