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Finding the Fourth Proportional to 387.05, 533.58 and 239.60

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Solution

The fourth proportional to 387.05, 533.58 and 239.60 is: 330.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.05 : 533.58 = 239.60 : x
  2. Step 2: Convert to fraction form
    387.05/533.58 = 239.60/x
  3. Step 3: Cross multiply
    387.05x = 533.58 × 239.60
  4. Step 4: Simplify right side
    387.05x = 127,845.77
  5. Step 5: Solve for x
    x = 127,845.77/387.05
  6. Step 6: Final answer
    x = 330.31

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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.