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Finding the Fourth Proportional to 319.90, 441.94 and 278.50

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Solution

The fourth proportional to 319.90, 441.94 and 278.50 is: 384.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.90 : 441.94 = 278.50 : x
  2. Step 2: Convert to fraction form
    319.90/441.94 = 278.50/x
  3. Step 3: Cross multiply
    319.90x = 441.94 × 278.50
  4. Step 4: Simplify right side
    319.90x = 123,080.29
  5. Step 5: Solve for x
    x = 123,080.29/319.90
  6. Step 6: Final answer
    x = 384.75

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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.