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Finding the Fourth Proportional to 1,112.81, 1,665.90 and 721.67

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Solution

The fourth proportional to 1,112.81, 1,665.90 and 721.67 is: 1,080.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.81 : 1,665.90 = 721.67 : x
  2. Step 2: Convert to fraction form
    1,112.81/1,665.90 = 721.67/x
  3. Step 3: Cross multiply
    1,112.81x = 1,665.90 × 721.67
  4. Step 4: Simplify right side
    1,112.81x = 1,202,221.72
  5. Step 5: Solve for x
    x = 1,202,221.72/1,112.81
  6. Step 6: Final answer
    x = 1,080.35

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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.