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Finding the Third Proportional to 4,915.50 and 7,621.50

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Solution

The third proportional to 4,915.50 and 7,621.50 is: 11,817.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,915.50 : 7,621.50 = 7,621.50 : x
  2. Step 2: Convert to fraction form
    4,915.50/7,621.50 = 7,621.50/x
  3. Step 3: Cross multiply
    4,915.50x = 7,621.50 × 7,621.50
  4. Step 4: Simplify right side
    4,915.50x = 58,087,262.25
  5. Step 5: Solve for x
    x = 58,087,262.25/4,915.50
  6. Step 6: Final answer
    x = 11,817.16

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.