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Finding the Fourth Proportional to 281.21, 419.83 and 215.87

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Solution

The fourth proportional to 281.21, 419.83 and 215.87 is: 322.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.21 : 419.83 = 215.87 : x
  2. Step 2: Convert to fraction form
    281.21/419.83 = 215.87/x
  3. Step 3: Cross multiply
    281.21x = 419.83 × 215.87
  4. Step 4: Simplify right side
    281.21x = 90,628.70
  5. Step 5: Solve for x
    x = 90,628.70/281.21
  6. Step 6: Final answer
    x = 322.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.