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Finding the Fourth Proportional to 318.89, 439.63 and 272.06

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Solution

The fourth proportional to 318.89, 439.63 and 272.06 is: 375.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.89 : 439.63 = 272.06 : x
  2. Step 2: Convert to fraction form
    318.89/439.63 = 272.06/x
  3. Step 3: Cross multiply
    318.89x = 439.63 × 272.06
  4. Step 4: Simplify right side
    318.89x = 119,604.51
  5. Step 5: Solve for x
    x = 119,604.51/318.89
  6. Step 6: Final answer
    x = 375.07

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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.