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Finding the Fourth Proportional to 281.85, 420.21 and 274.74

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Solution

The fourth proportional to 281.85, 420.21 and 274.74 is: 409.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.85 : 420.21 = 274.74 : x
  2. Step 2: Convert to fraction form
    281.85/420.21 = 274.74/x
  3. Step 3: Cross multiply
    281.85x = 420.21 × 274.74
  4. Step 4: Simplify right side
    281.85x = 115,448.50
  5. Step 5: Solve for x
    x = 115,448.50/281.85
  6. Step 6: Final answer
    x = 409.61

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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.