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Finding the Fourth Proportional to 825.21, 1,138.74 and 475.89

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Solution

The fourth proportional to 825.21, 1,138.74 and 475.89 is: 656.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.21 : 1,138.74 = 475.89 : x
  2. Step 2: Convert to fraction form
    825.21/1,138.74 = 475.89/x
  3. Step 3: Cross multiply
    825.21x = 1,138.74 × 475.89
  4. Step 4: Simplify right side
    825.21x = 541,914.98
  5. Step 5: Solve for x
    x = 541,914.98/825.21
  6. Step 6: Final answer
    x = 656.70

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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.