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Finding the Third Proportional to 478 and 556

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Solution

The third proportional to 478 and 556 is: 646.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    478 : 556 = 556 : x
  2. Step 2: Convert to fraction form
    478/556 = 556/x
  3. Step 3: Cross multiply
    478x = 556 × 556
  4. Step 4: Simplify right side
    478x = 309,136
  5. Step 5: Solve for x
    x = 309,136/478
  6. Step 6: Final answer
    x = 646.73

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Why These Related Problems?

These problems maintain the same ratio (1.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.