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Finding the Fourth Proportional to 608.69, 839.67 and 387.71

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Solution

The fourth proportional to 608.69, 839.67 and 387.71 is: 534.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.69 : 839.67 = 387.71 : x
  2. Step 2: Convert to fraction form
    608.69/839.67 = 387.71/x
  3. Step 3: Cross multiply
    608.69x = 839.67 × 387.71
  4. Step 4: Simplify right side
    608.69x = 325,544.26
  5. Step 5: Solve for x
    x = 325,544.26/608.69
  6. Step 6: Final answer
    x = 534.83

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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.