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Finding the Fourth Proportional to 388.94, 583.50 and 128.94

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Solution

The fourth proportional to 388.94, 583.50 and 128.94 is: 193.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.94 : 583.50 = 128.94 : x
  2. Step 2: Convert to fraction form
    388.94/583.50 = 128.94/x
  3. Step 3: Cross multiply
    388.94x = 583.50 × 128.94
  4. Step 4: Simplify right side
    388.94x = 75,236.49
  5. Step 5: Solve for x
    x = 75,236.49/388.94
  6. Step 6: Final answer
    x = 193.44

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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.