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Finding the Fourth Proportional to 388.80, 536.41 and 239.36

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Solution

The fourth proportional to 388.80, 536.41 and 239.36 is: 330.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.80 : 536.41 = 239.36 : x
  2. Step 2: Convert to fraction form
    388.80/536.41 = 239.36/x
  3. Step 3: Cross multiply
    388.80x = 536.41 × 239.36
  4. Step 4: Simplify right side
    388.80x = 128,395.10
  5. Step 5: Solve for x
    x = 128,395.10/388.80
  6. Step 6: Final answer
    x = 330.23

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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.