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Finding the Fourth Proportional to 1,213.31, 1,674.30 and 715.84

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Solution

The fourth proportional to 1,213.31, 1,674.30 and 715.84 is: 987.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.31 : 1,674.30 = 715.84 : x
  2. Step 2: Convert to fraction form
    1,213.31/1,674.30 = 715.84/x
  3. Step 3: Cross multiply
    1,213.31x = 1,674.30 × 715.84
  4. Step 4: Simplify right side
    1,213.31x = 1,198,529.41
  5. Step 5: Solve for x
    x = 1,198,529.41/1,213.31
  6. Step 6: Final answer
    x = 987.82

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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.