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Finding the Fourth Proportional to 1,091.64, 1,634.22 and 907.38

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Solution

The fourth proportional to 1,091.64, 1,634.22 and 907.38 is: 1,358.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.64 : 1,634.22 = 907.38 : x
  2. Step 2: Convert to fraction form
    1,091.64/1,634.22 = 907.38/x
  3. Step 3: Cross multiply
    1,091.64x = 1,634.22 × 907.38
  4. Step 4: Simplify right side
    1,091.64x = 1,482,858.54
  5. Step 5: Solve for x
    x = 1,482,858.54/1,091.64
  6. Step 6: Final answer
    x = 1,358.38

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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.