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Finding the Fourth Proportional to 1,091.80, 1,506.68 and 626

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Solution

The fourth proportional to 1,091.80, 1,506.68 and 626 is: 863.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.80 : 1,506.68 = 626 : x
  2. Step 2: Convert to fraction form
    1,091.80/1,506.68 = 626/x
  3. Step 3: Cross multiply
    1,091.80x = 1,506.68 × 626
  4. Step 4: Simplify right side
    1,091.80x = 943,181.68
  5. Step 5: Solve for x
    x = 943,181.68/1,091.80
  6. Step 6: Final answer
    x = 863.88

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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.