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Finding the Fourth Proportional to 682.81, 942.16 and 388.02

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Solution

The fourth proportional to 682.81, 942.16 and 388.02 is: 535.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.81 : 942.16 = 388.02 : x
  2. Step 2: Convert to fraction form
    682.81/942.16 = 388.02/x
  3. Step 3: Cross multiply
    682.81x = 942.16 × 388.02
  4. Step 4: Simplify right side
    682.81x = 365,578.31
  5. Step 5: Solve for x
    x = 365,578.31/682.81
  6. Step 6: Final answer
    x = 535.40

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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.