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Finding the Third Proportional to 1,916 and 4,778

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Solution

The third proportional to 1,916 and 4,778 is: 11,915.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916 : 4,778 = 4,778 : x
  2. Step 2: Convert to fraction form
    1,916/4,778 = 4,778/x
  3. Step 3: Cross multiply
    1,916x = 4,778 × 4,778
  4. Step 4: Simplify right side
    1,916x = 22,829,284
  5. Step 5: Solve for x
    x = 22,829,284/1,916
  6. Step 6: Final answer
    x = 11,915.08

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Why These Related Problems?

These problems maintain the same ratio (2.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.