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Finding the Fourth Proportional to 489.82, 675.82 and 315.27

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Solution

The fourth proportional to 489.82, 675.82 and 315.27 is: 434.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.82 : 675.82 = 315.27 : x
  2. Step 2: Convert to fraction form
    489.82/675.82 = 315.27/x
  3. Step 3: Cross multiply
    489.82x = 675.82 × 315.27
  4. Step 4: Simplify right side
    489.82x = 213,065.77
  5. Step 5: Solve for x
    x = 213,065.77/489.82
  6. Step 6: Final answer
    x = 434.99

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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.