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Finding the Fourth Proportional to 1,110.74, 1,532.79 and 668.68

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Solution

The fourth proportional to 1,110.74, 1,532.79 and 668.68 is: 922.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,110.74 : 1,532.79 = 668.68 : x
  2. Step 2: Convert to fraction form
    1,110.74/1,532.79 = 668.68/x
  3. Step 3: Cross multiply
    1,110.74x = 1,532.79 × 668.68
  4. Step 4: Simplify right side
    1,110.74x = 1,024,942.19
  5. Step 5: Solve for x
    x = 1,024,942.19/1,110.74
  6. Step 6: Final answer
    x = 922.76

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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.