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Finding the Fourth Proportional to 318.48, 441.38 and 309.17

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Solution

The fourth proportional to 318.48, 441.38 and 309.17 is: 428.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.48 : 441.38 = 309.17 : x
  2. Step 2: Convert to fraction form
    318.48/441.38 = 309.17/x
  3. Step 3: Cross multiply
    318.48x = 441.38 × 309.17
  4. Step 4: Simplify right side
    318.48x = 136,457.70
  5. Step 5: Solve for x
    x = 136,457.70/318.48
  6. Step 6: Final answer
    x = 428.47

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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.