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Finding the Fourth Proportional to 318.32, 441.53 and 309.89

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Solution

The fourth proportional to 318.32, 441.53 and 309.89 is: 429.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.32 : 441.53 = 309.89 : x
  2. Step 2: Convert to fraction form
    318.32/441.53 = 309.89/x
  3. Step 3: Cross multiply
    318.32x = 441.53 × 309.89
  4. Step 4: Simplify right side
    318.32x = 136,824.18
  5. Step 5: Solve for x
    x = 136,824.18/318.32
  6. Step 6: Final answer
    x = 429.84

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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.