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Finding the Fourth Proportional to 388.58, 536.28 and 218.26

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Solution

The fourth proportional to 388.58, 536.28 and 218.26 is: 301.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.58 : 536.28 = 218.26 : x
  2. Step 2: Convert to fraction form
    388.58/536.28 = 218.26/x
  3. Step 3: Cross multiply
    388.58x = 536.28 × 218.26
  4. Step 4: Simplify right side
    388.58x = 117,050.68
  5. Step 5: Solve for x
    x = 117,050.68/388.58
  6. Step 6: Final answer
    x = 301.23

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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.