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Finding the Fourth Proportional to 858.85, 1,285.08 and 512.37

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Solution

The fourth proportional to 858.85, 1,285.08 and 512.37 is: 766.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.85 : 1,285.08 = 512.37 : x
  2. Step 2: Convert to fraction form
    858.85/1,285.08 = 512.37/x
  3. Step 3: Cross multiply
    858.85x = 1,285.08 × 512.37
  4. Step 4: Simplify right side
    858.85x = 658,436.44
  5. Step 5: Solve for x
    x = 658,436.44/858.85
  6. Step 6: Final answer
    x = 766.65

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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.