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Finding the Fourth Proportional to 605, 906.87 and 280.58

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Solution

The fourth proportional to 605, 906.87 and 280.58 is: 420.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    605 : 906.87 = 280.58 : x
  2. Step 2: Convert to fraction form
    605/906.87 = 280.58/x
  3. Step 3: Cross multiply
    605x = 906.87 × 280.58
  4. Step 4: Simplify right side
    605x = 254,449.58
  5. Step 5: Solve for x
    x = 254,449.58/605
  6. Step 6: Final answer
    x = 420.58

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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.