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Finding the Fourth Proportional to 1,213.83, 1,674.87 and 689.76

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Solution

The fourth proportional to 1,213.83, 1,674.87 and 689.76 is: 951.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.83 : 1,674.87 = 689.76 : x
  2. Step 2: Convert to fraction form
    1,213.83/1,674.87 = 689.76/x
  3. Step 3: Cross multiply
    1,213.83x = 1,674.87 × 689.76
  4. Step 4: Simplify right side
    1,213.83x = 1,155,258.33
  5. Step 5: Solve for x
    x = 1,155,258.33/1,213.83
  6. Step 6: Final answer
    x = 951.75

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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.