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Finding the Fourth Proportional to 489.88, 675.93 and 315.19

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Solution

The fourth proportional to 489.88, 675.93 and 315.19 is: 434.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.88 : 675.93 = 315.19 : x
  2. Step 2: Convert to fraction form
    489.88/675.93 = 315.19/x
  3. Step 3: Cross multiply
    489.88x = 675.93 × 315.19
  4. Step 4: Simplify right side
    489.88x = 213,046.38
  5. Step 5: Solve for x
    x = 213,046.38/489.88
  6. Step 6: Final answer
    x = 434.90

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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.