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Finding the Fourth Proportional to 317.98, 439.12 and 273.90

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Solution

The fourth proportional to 317.98, 439.12 and 273.90 is: 378.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.98 : 439.12 = 273.90 : x
  2. Step 2: Convert to fraction form
    317.98/439.12 = 273.90/x
  3. Step 3: Cross multiply
    317.98x = 439.12 × 273.90
  4. Step 4: Simplify right side
    317.98x = 120,274.28
  5. Step 5: Solve for x
    x = 120,274.28/317.98
  6. Step 6: Final answer
    x = 378.25

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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.