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Finding the Fourth Proportional to 682.95, 942.31 and 403.20

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Solution

The fourth proportional to 682.95, 942.31 and 403.20 is: 556.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.95 : 942.31 = 403.20 : x
  2. Step 2: Convert to fraction form
    682.95/942.31 = 403.20/x
  3. Step 3: Cross multiply
    682.95x = 942.31 × 403.20
  4. Step 4: Simplify right side
    682.95x = 379,939.39
  5. Step 5: Solve for x
    x = 379,939.39/682.95
  6. Step 6: Final answer
    x = 556.32

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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.