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Finding the Fourth Proportional to 1,214.48, 1,675.89 and 717.09

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Solution

The fourth proportional to 1,214.48, 1,675.89 and 717.09 is: 989.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.48 : 1,675.89 = 717.09 : x
  2. Step 2: Convert to fraction form
    1,214.48/1,675.89 = 717.09/x
  3. Step 3: Cross multiply
    1,214.48x = 1,675.89 × 717.09
  4. Step 4: Simplify right side
    1,214.48x = 1,201,763.96
  5. Step 5: Solve for x
    x = 1,201,763.96/1,214.48
  6. Step 6: Final answer
    x = 989.53

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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.