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Finding the Fourth Proportional to 1,126.80, 1,690.56 and 694.26

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Solution

The fourth proportional to 1,126.80, 1,690.56 and 694.26 is: 1,041.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.80 : 1,690.56 = 694.26 : x
  2. Step 2: Convert to fraction form
    1,126.80/1,690.56 = 694.26/x
  3. Step 3: Cross multiply
    1,126.80x = 1,690.56 × 694.26
  4. Step 4: Simplify right side
    1,126.80x = 1,173,688.19
  5. Step 5: Solve for x
    x = 1,173,688.19/1,126.80
  6. Step 6: Final answer
    x = 1,041.61

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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.