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Finding the Fourth Proportional to 1,236.80, 1,858.48 and 749.92

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Solution

The fourth proportional to 1,236.80, 1,858.48 and 749.92 is: 1,126.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.80 : 1,858.48 = 749.92 : x
  2. Step 2: Convert to fraction form
    1,236.80/1,858.48 = 749.92/x
  3. Step 3: Cross multiply
    1,236.80x = 1,858.48 × 749.92
  4. Step 4: Simplify right side
    1,236.80x = 1,393,711.32
  5. Step 5: Solve for x
    x = 1,393,711.32/1,236.80
  6. Step 6: Final answer
    x = 1,126.87

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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.