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Finding the Fourth Proportional to 1,091.77, 1,636.69 and 398.31

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Solution

The fourth proportional to 1,091.77, 1,636.69 and 398.31 is: 597.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.77 : 1,636.69 = 398.31 : x
  2. Step 2: Convert to fraction form
    1,091.77/1,636.69 = 398.31/x
  3. Step 3: Cross multiply
    1,091.77x = 1,636.69 × 398.31
  4. Step 4: Simplify right side
    1,091.77x = 651,909.99
  5. Step 5: Solve for x
    x = 651,909.99/1,091.77
  6. Step 6: Final answer
    x = 597.11

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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.