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Finding the Fourth Proportional to 388.57, 583.28 and 205.91

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Solution

The fourth proportional to 388.57, 583.28 and 205.91 is: 309.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.57 : 583.28 = 205.91 : x
  2. Step 2: Convert to fraction form
    388.57/583.28 = 205.91/x
  3. Step 3: Cross multiply
    388.57x = 583.28 × 205.91
  4. Step 4: Simplify right side
    388.57x = 120,102.16
  5. Step 5: Solve for x
    x = 120,102.16/388.57
  6. Step 6: Final answer
    x = 309.09

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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.