Home / 1,372.20-2,055.58-721.32

Finding the Fourth Proportional to 1,372.20, 2,055.58 and 721.32

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Solution

The fourth proportional to 1,372.20, 2,055.58 and 721.32 is: 1,080.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.20 : 2,055.58 = 721.32 : x
  2. Step 2: Convert to fraction form
    1,372.20/2,055.58 = 721.32/x
  3. Step 3: Cross multiply
    1,372.20x = 2,055.58 × 721.32
  4. Step 4: Simplify right side
    1,372.20x = 1,482,730.97
  5. Step 5: Solve for x
    x = 1,482,730.97/1,372.20
  6. Step 6: Final answer
    x = 1,080.55

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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.