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Finding the Fourth Proportional to 1,235.94, 1,855.26 and 689.46

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Solution

The fourth proportional to 1,235.94, 1,855.26 and 689.46 is: 1,034.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.94 : 1,855.26 = 689.46 : x
  2. Step 2: Convert to fraction form
    1,235.94/1,855.26 = 689.46/x
  3. Step 3: Cross multiply
    1,235.94x = 1,855.26 × 689.46
  4. Step 4: Simplify right side
    1,235.94x = 1,279,127.56
  5. Step 5: Solve for x
    x = 1,279,127.56/1,235.94
  6. Step 6: Final answer
    x = 1,034.94

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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.