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Finding the Fourth Proportional to 857.56, 1,285.94 and 309.67

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Solution

The fourth proportional to 857.56, 1,285.94 and 309.67 is: 464.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.56 : 1,285.94 = 309.67 : x
  2. Step 2: Convert to fraction form
    857.56/1,285.94 = 309.67/x
  3. Step 3: Cross multiply
    857.56x = 1,285.94 × 309.67
  4. Step 4: Simplify right side
    857.56x = 398,217.04
  5. Step 5: Solve for x
    x = 398,217.04/857.56
  6. Step 6: Final answer
    x = 464.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.