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Finding the Fourth Proportional to 608.08, 839.20 and 386.96

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Solution

The fourth proportional to 608.08, 839.20 and 386.96 is: 534.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.08 : 839.20 = 386.96 : x
  2. Step 2: Convert to fraction form
    608.08/839.20 = 386.96/x
  3. Step 3: Cross multiply
    608.08x = 839.20 × 386.96
  4. Step 4: Simplify right side
    608.08x = 324,736.83
  5. Step 5: Solve for x
    x = 324,736.83/608.08
  6. Step 6: Final answer
    x = 534.04

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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.