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Finding the Third Proportional to 5,708 and 7,140

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Solution

The third proportional to 5,708 and 7,140 is: 8,931.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,708 : 7,140 = 7,140 : x
  2. Step 2: Convert to fraction form
    5,708/7,140 = 7,140/x
  3. Step 3: Cross multiply
    5,708x = 7,140 × 7,140
  4. Step 4: Simplify right side
    5,708x = 50,979,600
  5. Step 5: Solve for x
    x = 50,979,600/5,708
  6. Step 6: Final answer
    x = 8,931.25

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Why These Related Problems?

These problems maintain the same ratio (1.25) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.