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Finding the Third Proportional to 476 and 553

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Solution

The third proportional to 476 and 553 is: 642.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    476 : 553 = 553 : x
  2. Step 2: Convert to fraction form
    476/553 = 553/x
  3. Step 3: Cross multiply
    476x = 553 × 553
  4. Step 4: Simplify right side
    476x = 305,809
  5. Step 5: Solve for x
    x = 305,809/476
  6. Step 6: Final answer
    x = 642.46

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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.