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Finding the Fourth Proportional to 682.20, 942.12 and 486.12

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Solution

The fourth proportional to 682.20, 942.12 and 486.12 is: 671.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.20 : 942.12 = 486.12 : x
  2. Step 2: Convert to fraction form
    682.20/942.12 = 486.12/x
  3. Step 3: Cross multiply
    682.20x = 942.12 × 486.12
  4. Step 4: Simplify right side
    682.20x = 457,983.37
  5. Step 5: Solve for x
    x = 457,983.37/682.20
  6. Step 6: Final answer
    x = 671.33

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1.5x scale

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.