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Finding the Fourth Proportional to 1,091.76, 1,636.66 and 397.94

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Solution

The fourth proportional to 1,091.76, 1,636.66 and 397.94 is: 596.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.76 : 1,636.66 = 397.94 : x
  2. Step 2: Convert to fraction form
    1,091.76/1,636.66 = 397.94/x
  3. Step 3: Cross multiply
    1,091.76x = 1,636.66 × 397.94
  4. Step 4: Simplify right side
    1,091.76x = 651,284.55
  5. Step 5: Solve for x
    x = 651,284.55/1,091.76
  6. Step 6: Final answer
    x = 596.55

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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.