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Finding the Fourth Proportional to 1,213.76, 1,674.52 and 716.04

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Solution

The fourth proportional to 1,213.76, 1,674.52 and 716.04 is: 987.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.76 : 1,674.52 = 716.04 : x
  2. Step 2: Convert to fraction form
    1,213.76/1,674.52 = 716.04/x
  3. Step 3: Cross multiply
    1,213.76x = 1,674.52 × 716.04
  4. Step 4: Simplify right side
    1,213.76x = 1,199,023.30
  5. Step 5: Solve for x
    x = 1,199,023.30/1,213.76
  6. Step 6: Final answer
    x = 987.86

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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.