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Finding the Fourth Proportional to 388, 582.12 and 217.12

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Solution

The fourth proportional to 388, 582.12 and 217.12 is: 325.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    388 : 582.12 = 217.12 : x
  2. Step 2: Convert to fraction form
    388/582.12 = 217.12/x
  3. Step 3: Cross multiply
    388x = 582.12 × 217.12
  4. Step 4: Simplify right side
    388x = 126,389.89
  5. Step 5: Solve for x
    x = 126,389.89/388
  6. Step 6: Final answer
    x = 325.75

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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.