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Finding the Fourth Proportional to 281.07, 421.34 and 253.58

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Solution

The fourth proportional to 281.07, 421.34 and 253.58 is: 380.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.07 : 421.34 = 253.58 : x
  2. Step 2: Convert to fraction form
    281.07/421.34 = 253.58/x
  3. Step 3: Cross multiply
    281.07x = 421.34 × 253.58
  4. Step 4: Simplify right side
    281.07x = 106,840.02
  5. Step 5: Solve for x
    x = 106,840.02/281.07
  6. Step 6: Final answer
    x = 380.12

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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.