Home / 1,160.28-1,601.67-811.20

Finding the Fourth Proportional to 1,160.28, 1,601.67 and 811.20

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Solution

The fourth proportional to 1,160.28, 1,601.67 and 811.20 is: 1,119.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,160.28 : 1,601.67 = 811.20 : x
  2. Step 2: Convert to fraction form
    1,160.28/1,601.67 = 811.20/x
  3. Step 3: Cross multiply
    1,160.28x = 1,601.67 × 811.20
  4. Step 4: Simplify right side
    1,160.28x = 1,299,274.70
  5. Step 5: Solve for x
    x = 1,299,274.70/1,160.28
  6. Step 6: Final answer
    x = 1,119.79

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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.