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Finding the Fourth Proportional to 280.03, 420.21 and 115.58

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Solution

The fourth proportional to 280.03, 420.21 and 115.58 is: 173.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.03 : 420.21 = 115.58 : x
  2. Step 2: Convert to fraction form
    280.03/420.21 = 115.58/x
  3. Step 3: Cross multiply
    280.03x = 420.21 × 115.58
  4. Step 4: Simplify right side
    280.03x = 48,566.88
  5. Step 5: Solve for x
    x = 48,566.88/280.03
  6. Step 6: Final answer
    x = 173.43

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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.