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Finding the Fourth Proportional to 281.50, 421.31 and 220.92

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Solution

The fourth proportional to 281.50, 421.31 and 220.92 is: 330.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.50 : 421.31 = 220.92 : x
  2. Step 2: Convert to fraction form
    281.50/421.31 = 220.92/x
  3. Step 3: Cross multiply
    281.50x = 421.31 × 220.92
  4. Step 4: Simplify right side
    281.50x = 93,075.81
  5. Step 5: Solve for x
    x = 93,075.81/281.50
  6. Step 6: Final answer
    x = 330.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.