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Finding the Third Proportional to 7,140 and 9,210

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Solution

The third proportional to 7,140 and 9,210 is: 11,880.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,140 : 9,210 = 9,210 : x
  2. Step 2: Convert to fraction form
    7,140/9,210 = 9,210/x
  3. Step 3: Cross multiply
    7,140x = 9,210 × 9,210
  4. Step 4: Simplify right side
    7,140x = 84,824,100
  5. Step 5: Solve for x
    x = 84,824,100/7,140
  6. Step 6: Final answer
    x = 11,880.13

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.