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Finding the Fourth Proportional to 386.98, 534.14 and 239.53

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Solution

The fourth proportional to 386.98, 534.14 and 239.53 is: 330.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.98 : 534.14 = 239.53 : x
  2. Step 2: Convert to fraction form
    386.98/534.14 = 239.53/x
  3. Step 3: Cross multiply
    386.98x = 534.14 × 239.53
  4. Step 4: Simplify right side
    386.98x = 127,943.89
  5. Step 5: Solve for x
    x = 127,943.89/386.98
  6. Step 6: Final answer
    x = 330.62

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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.