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Finding the Fourth Proportional to 1,215, 1,676.43 and 717.66

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Solution

The fourth proportional to 1,215, 1,676.43 and 717.66 is: 990.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215 : 1,676.43 = 717.66 : x
  2. Step 2: Convert to fraction form
    1,215/1,676.43 = 717.66/x
  3. Step 3: Cross multiply
    1,215x = 1,676.43 × 717.66
  4. Step 4: Simplify right side
    1,215x = 1,203,106.75
  5. Step 5: Solve for x
    x = 1,203,106.75/1,215
  6. Step 6: Final answer
    x = 990.21

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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.