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Finding the Third Proportional to 7,420 and 10,778

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Solution

The third proportional to 7,420 and 10,778 is: 15,655.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,420 : 10,778 = 10,778 : x
  2. Step 2: Convert to fraction form
    7,420/10,778 = 10,778/x
  3. Step 3: Cross multiply
    7,420x = 10,778 × 10,778
  4. Step 4: Simplify right side
    7,420x = 116,165,284
  5. Step 5: Solve for x
    x = 116,165,284/7,420
  6. Step 6: Final answer
    x = 15,655.70

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.