Home / 1,211.90-1,820.58-725.29

Finding the Fourth Proportional to 1,211.90, 1,820.58 and 725.29

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Solution

The fourth proportional to 1,211.90, 1,820.58 and 725.29 is: 1,089.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.90 : 1,820.58 = 725.29 : x
  2. Step 2: Convert to fraction form
    1,211.90/1,820.58 = 725.29/x
  3. Step 3: Cross multiply
    1,211.90x = 1,820.58 × 725.29
  4. Step 4: Simplify right side
    1,211.90x = 1,320,457.56
  5. Step 5: Solve for x
    x = 1,320,457.56/1,211.90
  6. Step 6: Final answer
    x = 1,089.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.