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Finding the Fourth Proportional to 388.85, 536.45 and 239.36

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Solution

The fourth proportional to 388.85, 536.45 and 239.36 is: 330.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.85 : 536.45 = 239.36 : x
  2. Step 2: Convert to fraction form
    388.85/536.45 = 239.36/x
  3. Step 3: Cross multiply
    388.85x = 536.45 × 239.36
  4. Step 4: Simplify right side
    388.85x = 128,400.79
  5. Step 5: Solve for x
    x = 128,400.79/388.85
  6. Step 6: Final answer
    x = 330.21

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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.