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Finding the Fourth Proportional to 438.93, 605.34 and 355.77

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Solution

The fourth proportional to 438.93, 605.34 and 355.77 is: 490.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.93 : 605.34 = 355.77 : x
  2. Step 2: Convert to fraction form
    438.93/605.34 = 355.77/x
  3. Step 3: Cross multiply
    438.93x = 605.34 × 355.77
  4. Step 4: Simplify right side
    438.93x = 215,361.81
  5. Step 5: Solve for x
    x = 215,361.81/438.93
  6. Step 6: Final answer
    x = 490.65

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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.