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Finding the Third Proportional to 684.75 and 972

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Solution

The third proportional to 684.75 and 972 is: 1,379.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.75 : 972 = 972 : x
  2. Step 2: Convert to fraction form
    684.75/972 = 972/x
  3. Step 3: Cross multiply
    684.75x = 972 × 972
  4. Step 4: Simplify right side
    684.75x = 944,784
  5. Step 5: Solve for x
    x = 944,784/684.75
  6. Step 6: Final answer
    x = 1,379.75

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.