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Finding the Fourth Proportional to 281.21, 418.58 and 275.13

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Solution

The fourth proportional to 281.21, 418.58 and 275.13 is: 409.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.21 : 418.58 = 275.13 : x
  2. Step 2: Convert to fraction form
    281.21/418.58 = 275.13/x
  3. Step 3: Cross multiply
    281.21x = 418.58 × 275.13
  4. Step 4: Simplify right side
    281.21x = 115,165.12
  5. Step 5: Solve for x
    x = 115,165.12/281.21
  6. Step 6: Final answer
    x = 409.54

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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.