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Finding the Fourth Proportional to 553.60, 762.87 and 518.06

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Solution

The fourth proportional to 553.60, 762.87 and 518.06 is: 713.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.60 : 762.87 = 518.06 : x
  2. Step 2: Convert to fraction form
    553.60/762.87 = 518.06/x
  3. Step 3: Cross multiply
    553.60x = 762.87 × 518.06
  4. Step 4: Simplify right side
    553.60x = 395,213.37
  5. Step 5: Solve for x
    x = 395,213.37/553.60
  6. Step 6: Final answer
    x = 713.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.