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Finding the Fourth Proportional to 280.83, 421.23 and 107.47

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Solution

The fourth proportional to 280.83, 421.23 and 107.47 is: 161.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.83 : 421.23 = 107.47 : x
  2. Step 2: Convert to fraction form
    280.83/421.23 = 107.47/x
  3. Step 3: Cross multiply
    280.83x = 421.23 × 107.47
  4. Step 4: Simplify right side
    280.83x = 45,269.59
  5. Step 5: Solve for x
    x = 45,269.59/280.83
  6. Step 6: Final answer
    x = 161.20

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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.