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Finding the Fourth Proportional to 1,185.61, 1,636.09 and 743.76

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Solution

The fourth proportional to 1,185.61, 1,636.09 and 743.76 is: 1,026.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.61 : 1,636.09 = 743.76 : x
  2. Step 2: Convert to fraction form
    1,185.61/1,636.09 = 743.76/x
  3. Step 3: Cross multiply
    1,185.61x = 1,636.09 × 743.76
  4. Step 4: Simplify right side
    1,185.61x = 1,216,850.12
  5. Step 5: Solve for x
    x = 1,216,850.12/1,185.61
  6. Step 6: Final answer
    x = 1,026.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.