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Finding the Third Proportional to 427.88 and 626.63

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Solution

The third proportional to 427.88 and 626.63 is: 917.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.88 : 626.63 = 626.63 : x
  2. Step 2: Convert to fraction form
    427.88/626.63 = 626.63/x
  3. Step 3: Cross multiply
    427.88x = 626.63 × 626.63
  4. Step 4: Simplify right side
    427.88x = 392,658.89
  5. Step 5: Solve for x
    x = 392,658.89/427.88
  6. Step 6: Final answer
    x = 917.70

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.