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Finding the Fourth Proportional to 388.39, 535.64 and 283.83

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Solution

The fourth proportional to 388.39, 535.64 and 283.83 is: 391.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.39 : 535.64 = 283.83 : x
  2. Step 2: Convert to fraction form
    388.39/535.64 = 283.83/x
  3. Step 3: Cross multiply
    388.39x = 535.64 × 283.83
  4. Step 4: Simplify right side
    388.39x = 152,028.02
  5. Step 5: Solve for x
    x = 152,028.02/388.39
  6. Step 6: Final answer
    x = 391.44

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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.