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Finding the Fourth Proportional to 1,236.99, 1,708.36 and 840.42

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Solution

The fourth proportional to 1,236.99, 1,708.36 and 840.42 is: 1,160.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,236.99 : 1,708.36 = 840.42 : x
  2. Step 2: Convert to fraction form
    1,236.99/1,708.36 = 840.42/x
  3. Step 3: Cross multiply
    1,236.99x = 1,708.36 × 840.42
  4. Step 4: Simplify right side
    1,236.99x = 1,435,739.91
  5. Step 5: Solve for x
    x = 1,435,739.91/1,236.99
  6. Step 6: Final answer
    x = 1,160.67

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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.