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Finding the Fourth Proportional to 386.95, 534.05 and 239.64

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Solution

The fourth proportional to 386.95, 534.05 and 239.64 is: 330.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.95 : 534.05 = 239.64 : x
  2. Step 2: Convert to fraction form
    386.95/534.05 = 239.64/x
  3. Step 3: Cross multiply
    386.95x = 534.05 × 239.64
  4. Step 4: Simplify right side
    386.95x = 127,979.74
  5. Step 5: Solve for x
    x = 127,979.74/386.95
  6. Step 6: Final answer
    x = 330.74

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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.