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Finding the Fourth Proportional to 280.95, 420.72 and 144.06

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Solution

The fourth proportional to 280.95, 420.72 and 144.06 is: 215.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.95 : 420.72 = 144.06 : x
  2. Step 2: Convert to fraction form
    280.95/420.72 = 144.06/x
  3. Step 3: Cross multiply
    280.95x = 420.72 × 144.06
  4. Step 4: Simplify right side
    280.95x = 60,608.92
  5. Step 5: Solve for x
    x = 60,608.92/280.95
  6. Step 6: Final answer
    x = 215.73

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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.