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Finding the Fourth Proportional to 1,091.60, 1,639.49 and 935.77

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Solution

The fourth proportional to 1,091.60, 1,639.49 and 935.77 is: 1,405.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.60 : 1,639.49 = 935.77 : x
  2. Step 2: Convert to fraction form
    1,091.60/1,639.49 = 935.77/x
  3. Step 3: Cross multiply
    1,091.60x = 1,639.49 × 935.77
  4. Step 4: Simplify right side
    1,091.60x = 1,534,185.56
  5. Step 5: Solve for x
    x = 1,534,185.56/1,091.60
  6. Step 6: Final answer
    x = 1,405.45

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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.