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Finding the Fourth Proportional to 438.20, 604.86 and 290.87

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Solution

The fourth proportional to 438.20, 604.86 and 290.87 is: 401.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.20 : 604.86 = 290.87 : x
  2. Step 2: Convert to fraction form
    438.20/604.86 = 290.87/x
  3. Step 3: Cross multiply
    438.20x = 604.86 × 290.87
  4. Step 4: Simplify right side
    438.20x = 175,932.60
  5. Step 5: Solve for x
    x = 175,932.60/438.20
  6. Step 6: Final answer
    x = 401.49

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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.