Home / 1,126.92-1,690.40-305.21

Finding the Fourth Proportional to 1,126.92, 1,690.40 and 305.21

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Solution

The fourth proportional to 1,126.92, 1,690.40 and 305.21 is: 457.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.92 : 1,690.40 = 305.21 : x
  2. Step 2: Convert to fraction form
    1,126.92/1,690.40 = 305.21/x
  3. Step 3: Cross multiply
    1,126.92x = 1,690.40 × 305.21
  4. Step 4: Simplify right side
    1,126.92x = 515,917.01
  5. Step 5: Solve for x
    x = 515,917.01/1,126.92
  6. Step 6: Final answer
    x = 457.81

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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.