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Finding the Fourth Proportional to 386.74, 533.74 and 239.35

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Solution

The fourth proportional to 386.74, 533.74 and 239.35 is: 330.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.74 : 533.74 = 239.35 : x
  2. Step 2: Convert to fraction form
    386.74/533.74 = 239.35/x
  3. Step 3: Cross multiply
    386.74x = 533.74 × 239.35
  4. Step 4: Simplify right side
    386.74x = 127,748.74
  5. Step 5: Solve for x
    x = 127,748.74/386.74
  6. Step 6: Final answer
    x = 330.32

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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.