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Finding the Fourth Proportional to 283.45, 390.43 and 239.14

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Solution

The fourth proportional to 283.45, 390.43 and 239.14 is: 329.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.45 : 390.43 = 239.14 : x
  2. Step 2: Convert to fraction form
    283.45/390.43 = 239.14/x
  3. Step 3: Cross multiply
    283.45x = 390.43 × 239.14
  4. Step 4: Simplify right side
    283.45x = 93,367.43
  5. Step 5: Solve for x
    x = 93,367.43/283.45
  6. Step 6: Final answer
    x = 329.40

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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.