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Finding the Fourth Proportional to 612.86, 845.41 and 388.38

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Solution

The fourth proportional to 612.86, 845.41 and 388.38 is: 535.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.86 : 845.41 = 388.38 : x
  2. Step 2: Convert to fraction form
    612.86/845.41 = 388.38/x
  3. Step 3: Cross multiply
    612.86x = 845.41 × 388.38
  4. Step 4: Simplify right side
    612.86x = 328,338.39
  5. Step 5: Solve for x
    x = 328,338.39/612.86
  6. Step 6: Final answer
    x = 535.75

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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.