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Finding the Third Proportional to 972 and 2,128

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Solution

The third proportional to 972 and 2,128 is: 4,658.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    972 : 2,128 = 2,128 : x
  2. Step 2: Convert to fraction form
    972/2,128 = 2,128/x
  3. Step 3: Cross multiply
    972x = 2,128 × 2,128
  4. Step 4: Simplify right side
    972x = 4,528,384
  5. Step 5: Solve for x
    x = 4,528,384/972
  6. Step 6: Final answer
    x = 4,658.83

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.