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Finding the Fourth Proportional to 1,605.90, 2,408.37 and 1,281.90

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Solution

The fourth proportional to 1,605.90, 2,408.37 and 1,281.90 is: 1,922.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605.90 : 2,408.37 = 1,281.90 : x
  2. Step 2: Convert to fraction form
    1,605.90/2,408.37 = 1,281.90/x
  3. Step 3: Cross multiply
    1,605.90x = 2,408.37 × 1,281.90
  4. Step 4: Simplify right side
    1,605.90x = 3,087,289.50
  5. Step 5: Solve for x
    x = 3,087,289.50/1,605.90
  6. Step 6: Final answer
    x = 1,922.47

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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.