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Finding the Fourth Proportional to 682.87, 942.36 and 388.15

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Solution

The fourth proportional to 682.87, 942.36 and 388.15 is: 535.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.87 : 942.36 = 388.15 : x
  2. Step 2: Convert to fraction form
    682.87/942.36 = 388.15/x
  3. Step 3: Cross multiply
    682.87x = 942.36 × 388.15
  4. Step 4: Simplify right side
    682.87x = 365,779.35
  5. Step 5: Solve for x
    x = 365,779.35/682.87
  6. Step 6: Final answer
    x = 535.65

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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.