Home / 1,391.21-2,087.37-610.81

Finding the Fourth Proportional to 1,391.21, 2,087.37 and 610.81

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Solution

The fourth proportional to 1,391.21, 2,087.37 and 610.81 is: 916.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.21 : 2,087.37 = 610.81 : x
  2. Step 2: Convert to fraction form
    1,391.21/2,087.37 = 610.81/x
  3. Step 3: Cross multiply
    1,391.21x = 2,087.37 × 610.81
  4. Step 4: Simplify right side
    1,391.21x = 1,274,981.25
  5. Step 5: Solve for x
    x = 1,274,981.25/1,391.21
  6. Step 6: Final answer
    x = 916.46

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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.