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Finding the Fourth Proportional to 1,092.85, 1,636.99 and 860.64

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Solution

The fourth proportional to 1,092.85, 1,636.99 and 860.64 is: 1,289.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,092.85 : 1,636.99 = 860.64 : x
  2. Step 2: Convert to fraction form
    1,092.85/1,636.99 = 860.64/x
  3. Step 3: Cross multiply
    1,092.85x = 1,636.99 × 860.64
  4. Step 4: Simplify right side
    1,092.85x = 1,408,859.07
  5. Step 5: Solve for x
    x = 1,408,859.07/1,092.85
  6. Step 6: Final answer
    x = 1,289.16

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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.