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Finding the Fourth Proportional to 608.42, 912 and 389.21

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Solution

The fourth proportional to 608.42, 912 and 389.21 is: 583.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.42 : 912 = 389.21 : x
  2. Step 2: Convert to fraction form
    608.42/912 = 389.21/x
  3. Step 3: Cross multiply
    608.42x = 912 × 389.21
  4. Step 4: Simplify right side
    608.42x = 354,959.52
  5. Step 5: Solve for x
    x = 354,959.52/608.42
  6. Step 6: Final answer
    x = 583.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.