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Finding the Fourth Proportional to 1,213.71, 1,674.81 and 689.64

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Solution

The fourth proportional to 1,213.71, 1,674.81 and 689.64 is: 951.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.71 : 1,674.81 = 689.64 : x
  2. Step 2: Convert to fraction form
    1,213.71/1,674.81 = 689.64/x
  3. Step 3: Cross multiply
    1,213.71x = 1,674.81 × 689.64
  4. Step 4: Simplify right side
    1,213.71x = 1,155,015.97
  5. Step 5: Solve for x
    x = 1,155,015.97/1,213.71
  6. Step 6: Final answer
    x = 951.64

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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.