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Finding the Third Proportional to 1,388 and 2,556

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Solution

The third proportional to 1,388 and 2,556 is: 4,706.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388 : 2,556 = 2,556 : x
  2. Step 2: Convert to fraction form
    1,388/2,556 = 2,556/x
  3. Step 3: Cross multiply
    1,388x = 2,556 × 2,556
  4. Step 4: Simplify right side
    1,388x = 6,533,136
  5. Step 5: Solve for x
    x = 6,533,136/1,388
  6. Step 6: Final answer
    x = 4,706.87

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Why These Related Problems?

These problems maintain the same ratio (1.84) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.