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Finding the Fourth Proportional to 1,112.32, 1,668.32 and 679.36

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Solution

The fourth proportional to 1,112.32, 1,668.32 and 679.36 is: 1,018.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.32 : 1,668.32 = 679.36 : x
  2. Step 2: Convert to fraction form
    1,112.32/1,668.32 = 679.36/x
  3. Step 3: Cross multiply
    1,112.32x = 1,668.32 × 679.36
  4. Step 4: Simplify right side
    1,112.32x = 1,133,389.88
  5. Step 5: Solve for x
    x = 1,133,389.88/1,112.32
  6. Step 6: Final answer
    x = 1,018.94

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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.