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Finding the Fourth Proportional to 1,605.78, 2,408.64 and 681.12

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Solution

The fourth proportional to 1,605.78, 2,408.64 and 681.12 is: 1,021.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605.78 : 2,408.64 = 681.12 : x
  2. Step 2: Convert to fraction form
    1,605.78/2,408.64 = 681.12/x
  3. Step 3: Cross multiply
    1,605.78x = 2,408.64 × 681.12
  4. Step 4: Simplify right side
    1,605.78x = 1,640,572.88
  5. Step 5: Solve for x
    x = 1,640,572.88/1,605.78
  6. Step 6: Final answer
    x = 1,021.67

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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.