Home / 1,112.35-1,668.21-747.31

Finding the Fourth Proportional to 1,112.35, 1,668.21 and 747.31

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Solution

The fourth proportional to 1,112.35, 1,668.21 and 747.31 is: 1,120.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.35 : 1,668.21 = 747.31 : x
  2. Step 2: Convert to fraction form
    1,112.35/1,668.21 = 747.31/x
  3. Step 3: Cross multiply
    1,112.35x = 1,668.21 × 747.31
  4. Step 4: Simplify right side
    1,112.35x = 1,246,670.02
  5. Step 5: Solve for x
    x = 1,246,670.02/1,112.35
  6. Step 6: Final answer
    x = 1,120.75

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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.