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Finding the Third Proportional to 489.94 and 915.19

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Solution

The third proportional to 489.94 and 915.19 is: 1,709.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.94 : 915.19 = 915.19 : x
  2. Step 2: Convert to fraction form
    489.94/915.19 = 915.19/x
  3. Step 3: Cross multiply
    489.94x = 915.19 × 915.19
  4. Step 4: Simplify right side
    489.94x = 837,568.16
  5. Step 5: Solve for x
    x = 837,568.16/489.94
  6. Step 6: Final answer
    x = 1,709.54

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Why These Related Problems?

These problems maintain the same ratio (1.87) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.