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Finding the Third Proportional to 5,391 and 7,280

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Solution

The third proportional to 5,391 and 7,280 is: 9,830.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,391 : 7,280 = 7,280 : x
  2. Step 2: Convert to fraction form
    5,391/7,280 = 7,280/x
  3. Step 3: Cross multiply
    5,391x = 7,280 × 7,280
  4. Step 4: Simplify right side
    5,391x = 52,998,400
  5. Step 5: Solve for x
    x = 52,998,400/5,391
  6. Step 6: Final answer
    x = 9,830.90

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.