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Finding the Fourth Proportional to 1,636.76, 2,455.75 and 663.55

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Solution

The fourth proportional to 1,636.76, 2,455.75 and 663.55 is: 995.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,636.76 : 2,455.75 = 663.55 : x
  2. Step 2: Convert to fraction form
    1,636.76/2,455.75 = 663.55/x
  3. Step 3: Cross multiply
    1,636.76x = 2,455.75 × 663.55
  4. Step 4: Simplify right side
    1,636.76x = 1,629,507.60
  5. Step 5: Solve for x
    x = 1,629,507.60/1,636.76
  6. Step 6: Final answer
    x = 995.57

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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.