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Finding the Fourth Proportional to 1,121.42, 1,546.47 and 722.67

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Solution

The fourth proportional to 1,121.42, 1,546.47 and 722.67 is: 996.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.42 : 1,546.47 = 722.67 : x
  2. Step 2: Convert to fraction form
    1,121.42/1,546.47 = 722.67/x
  3. Step 3: Cross multiply
    1,121.42x = 1,546.47 × 722.67
  4. Step 4: Simplify right side
    1,121.42x = 1,117,587.47
  5. Step 5: Solve for x
    x = 1,117,587.47/1,121.42
  6. Step 6: Final answer
    x = 996.58

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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.