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Finding the Fourth Proportional to 1,213.28, 1,674.36 and 715.66

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Solution

The fourth proportional to 1,213.28, 1,674.36 and 715.66 is: 987.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.28 : 1,674.36 = 715.66 : x
  2. Step 2: Convert to fraction form
    1,213.28/1,674.36 = 715.66/x
  3. Step 3: Cross multiply
    1,213.28x = 1,674.36 × 715.66
  4. Step 4: Simplify right side
    1,213.28x = 1,198,272.48
  5. Step 5: Solve for x
    x = 1,198,272.48/1,213.28
  6. Step 6: Final answer
    x = 987.63

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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.