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Finding the Fourth Proportional to 1,236.12, 1,854 and 687.96

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Solution

The fourth proportional to 1,236.12, 1,854 and 687.96 is: 1,031.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.12 : 1,854 = 687.96 : x
  2. Step 2: Convert to fraction form
    1,236.12/1,854 = 687.96/x
  3. Step 3: Cross multiply
    1,236.12x = 1,854 × 687.96
  4. Step 4: Simplify right side
    1,236.12x = 1,275,477.84
  5. Step 5: Solve for x
    x = 1,275,477.84/1,236.12
  6. Step 6: Final answer
    x = 1,031.84

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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.