Home / 1,955.12-2,930.62-721.74

Finding the Fourth Proportional to 1,955.12, 2,930.62 and 721.74

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Solution

The fourth proportional to 1,955.12, 2,930.62 and 721.74 is: 1,081.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,955.12 : 2,930.62 = 721.74 : x
  2. Step 2: Convert to fraction form
    1,955.12/2,930.62 = 721.74/x
  3. Step 3: Cross multiply
    1,955.12x = 2,930.62 × 721.74
  4. Step 4: Simplify right side
    1,955.12x = 2,115,145.68
  5. Step 5: Solve for x
    x = 2,115,145.68/1,955.12
  6. Step 6: Final answer
    x = 1,081.85

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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.