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Finding the Fourth Proportional to 280.30, 420.61 and 126.22

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Solution

The fourth proportional to 280.30, 420.61 and 126.22 is: 189.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.30 : 420.61 = 126.22 : x
  2. Step 2: Convert to fraction form
    280.30/420.61 = 126.22/x
  3. Step 3: Cross multiply
    280.30x = 420.61 × 126.22
  4. Step 4: Simplify right side
    280.30x = 53,089.39
  5. Step 5: Solve for x
    x = 53,089.39/280.30
  6. Step 6: Final answer
    x = 189.40

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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.