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Finding the Fourth Proportional to 280.20, 420.48 and 235.08

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Solution

The fourth proportional to 280.20, 420.48 and 235.08 is: 352.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.20 : 420.48 = 235.08 : x
  2. Step 2: Convert to fraction form
    280.20/420.48 = 235.08/x
  3. Step 3: Cross multiply
    280.20x = 420.48 × 235.08
  4. Step 4: Simplify right side
    280.20x = 98,846.44
  5. Step 5: Solve for x
    x = 98,846.44/280.20
  6. Step 6: Final answer
    x = 352.77

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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.