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Finding the Fourth Proportional to 608.53, 912.12 and 388.90

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Solution

The fourth proportional to 608.53, 912.12 and 388.90 is: 582.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.53 : 912.12 = 388.90 : x
  2. Step 2: Convert to fraction form
    608.53/912.12 = 388.90/x
  3. Step 3: Cross multiply
    608.53x = 912.12 × 388.90
  4. Step 4: Simplify right side
    608.53x = 354,723.47
  5. Step 5: Solve for x
    x = 354,723.47/608.53
  6. Step 6: Final answer
    x = 582.92

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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.