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Finding the Fourth Proportional to 1,214.68, 1,676.38 and 717.26

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Solution

The fourth proportional to 1,214.68, 1,676.38 and 717.26 is: 989.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.68 : 1,676.38 = 717.26 : x
  2. Step 2: Convert to fraction form
    1,214.68/1,676.38 = 717.26/x
  3. Step 3: Cross multiply
    1,214.68x = 1,676.38 × 717.26
  4. Step 4: Simplify right side
    1,214.68x = 1,202,400.32
  5. Step 5: Solve for x
    x = 1,202,400.32/1,214.68
  6. Step 6: Final answer
    x = 989.89

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1.5x scale

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.