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Finding the Third Proportional to 1,242.84 and 1,742.20

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Solution

The third proportional to 1,242.84 and 1,742.20 is: 2,442.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.84 : 1,742.20 = 1,742.20 : x
  2. Step 2: Convert to fraction form
    1,242.84/1,742.20 = 1,742.20/x
  3. Step 3: Cross multiply
    1,242.84x = 1,742.20 × 1,742.20
  4. Step 4: Simplify right side
    1,242.84x = 3,035,271.73
  5. Step 5: Solve for x
    x = 3,035,271.73/1,242.84
  6. Step 6: Final answer
    x = 2,442.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.