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Finding the Third Proportional to 5,210 and 7,820

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Solution

The third proportional to 5,210 and 7,820 is: 11,737.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,210 : 7,820 = 7,820 : x
  2. Step 2: Convert to fraction form
    5,210/7,820 = 7,820/x
  3. Step 3: Cross multiply
    5,210x = 7,820 × 7,820
  4. Step 4: Simplify right side
    5,210x = 61,152,400
  5. Step 5: Solve for x
    x = 61,152,400/5,210
  6. Step 6: Final answer
    x = 11,737.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.