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Finding the Fourth Proportional to 388, 582.20 and 144.60

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Solution

The fourth proportional to 388, 582.20 and 144.60 is: 216.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    388 : 582.20 = 144.60 : x
  2. Step 2: Convert to fraction form
    388/582.20 = 144.60/x
  3. Step 3: Cross multiply
    388x = 582.20 × 144.60
  4. Step 4: Simplify right side
    388x = 84,186.12
  5. Step 5: Solve for x
    x = 84,186.12/388
  6. Step 6: Final answer
    x = 216.97

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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.