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Finding the Third Proportional to 5,310 and 7,810

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Solution

The third proportional to 5,310 and 7,810 is: 11,487.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,310 : 7,810 = 7,810 : x
  2. Step 2: Convert to fraction form
    5,310/7,810 = 7,810/x
  3. Step 3: Cross multiply
    5,310x = 7,810 × 7,810
  4. Step 4: Simplify right side
    5,310x = 60,996,100
  5. Step 5: Solve for x
    x = 60,996,100/5,310
  6. Step 6: Final answer
    x = 11,487.02

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.