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Finding the Fourth Proportional to 317.82, 440.83 and 309.39

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Solution

The fourth proportional to 317.82, 440.83 and 309.39 is: 429.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.82 : 440.83 = 309.39 : x
  2. Step 2: Convert to fraction form
    317.82/440.83 = 309.39/x
  3. Step 3: Cross multiply
    317.82x = 440.83 × 309.39
  4. Step 4: Simplify right side
    317.82x = 136,388.39
  5. Step 5: Solve for x
    x = 136,388.39/317.82
  6. Step 6: Final answer
    x = 429.14

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.