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Finding the Fourth Proportional to 280.81, 421.23 and 75.35

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Solution

The fourth proportional to 280.81, 421.23 and 75.35 is: 113.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.81 : 421.23 = 75.35 : x
  2. Step 2: Convert to fraction form
    280.81/421.23 = 75.35/x
  3. Step 3: Cross multiply
    280.81x = 421.23 × 75.35
  4. Step 4: Simplify right side
    280.81x = 31,738.22
  5. Step 5: Solve for x
    x = 31,738.22/280.81
  6. Step 6: Final answer
    x = 113.03

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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.