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Finding the Fourth Proportional to 439.05, 605.47 and 281.51

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Solution

The fourth proportional to 439.05, 605.47 and 281.51 is: 388.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.05 : 605.47 = 281.51 : x
  2. Step 2: Convert to fraction form
    439.05/605.47 = 281.51/x
  3. Step 3: Cross multiply
    439.05x = 605.47 × 281.51
  4. Step 4: Simplify right side
    439.05x = 170,445.86
  5. Step 5: Solve for x
    x = 170,445.86/439.05
  6. Step 6: Final answer
    x = 388.22

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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.