Home / 1,210.45-1,671.01-811.97

Finding the Fourth Proportional to 1,210.45, 1,671.01 and 811.97

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Solution

The fourth proportional to 1,210.45, 1,671.01 and 811.97 is: 1,120.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.45 : 1,671.01 = 811.97 : x
  2. Step 2: Convert to fraction form
    1,210.45/1,671.01 = 811.97/x
  3. Step 3: Cross multiply
    1,210.45x = 1,671.01 × 811.97
  4. Step 4: Simplify right side
    1,210.45x = 1,356,797.57
  5. Step 5: Solve for x
    x = 1,356,797.57/1,210.45
  6. Step 6: Final answer
    x = 1,120.90

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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.