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Finding the Third Proportional to 780 and 1,656

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Solution

The third proportional to 780 and 1,656 is: 3,515.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    780 : 1,656 = 1,656 : x
  2. Step 2: Convert to fraction form
    780/1,656 = 1,656/x
  3. Step 3: Cross multiply
    780x = 1,656 × 1,656
  4. Step 4: Simplify right side
    780x = 2,742,336
  5. Step 5: Solve for x
    x = 2,742,336/780
  6. Step 6: Final answer
    x = 3,515.82

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.