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Finding the Fourth Proportional to 280.34, 420.54 and 126.20

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Solution

The fourth proportional to 280.34, 420.54 and 126.20 is: 189.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.34 : 420.54 = 126.20 : x
  2. Step 2: Convert to fraction form
    280.34/420.54 = 126.20/x
  3. Step 3: Cross multiply
    280.34x = 420.54 × 126.20
  4. Step 4: Simplify right side
    280.34x = 53,072.15
  5. Step 5: Solve for x
    x = 53,072.15/280.34
  6. Step 6: Final answer
    x = 189.31

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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.