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Finding the Fourth Proportional to 682.60, 942.20 and 402.81

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Solution

The fourth proportional to 682.60, 942.20 and 402.81 is: 556.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.60 : 942.20 = 402.81 : x
  2. Step 2: Convert to fraction form
    682.60/942.20 = 402.81/x
  3. Step 3: Cross multiply
    682.60x = 942.20 × 402.81
  4. Step 4: Simplify right side
    682.60x = 379,527.58
  5. Step 5: Solve for x
    x = 379,527.58/682.60
  6. Step 6: Final answer
    x = 556.00

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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.