Home / 1,395.36-1,921.20-1,265.76

Finding the Fourth Proportional to 1,395.36, 1,921.20 and 1,265.76

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Solution

The fourth proportional to 1,395.36, 1,921.20 and 1,265.76 is: 1,742.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.36 : 1,921.20 = 1,265.76 : x
  2. Step 2: Convert to fraction form
    1,395.36/1,921.20 = 1,265.76/x
  3. Step 3: Cross multiply
    1,395.36x = 1,921.20 × 1,265.76
  4. Step 4: Simplify right side
    1,395.36x = 2,431,778.11
  5. Step 5: Solve for x
    x = 2,431,778.11/1,395.36
  6. Step 6: Final answer
    x = 1,742.76

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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.