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Finding the Third Proportional to 1,131 and 1,455

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Solution

The third proportional to 1,131 and 1,455 is: 1,871.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131 : 1,455 = 1,455 : x
  2. Step 2: Convert to fraction form
    1,131/1,455 = 1,455/x
  3. Step 3: Cross multiply
    1,131x = 1,455 × 1,455
  4. Step 4: Simplify right side
    1,131x = 2,117,025
  5. Step 5: Solve for x
    x = 2,117,025/1,131
  6. Step 6: Final answer
    x = 1,871.82

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Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.