Home / 1,370.32-2,055.68-721.10

Finding the Fourth Proportional to 1,370.32, 2,055.68 and 721.10

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Solution

The fourth proportional to 1,370.32, 2,055.68 and 721.10 is: 1,081.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.32 : 2,055.68 = 721.10 : x
  2. Step 2: Convert to fraction form
    1,370.32/2,055.68 = 721.10/x
  3. Step 3: Cross multiply
    1,370.32x = 2,055.68 × 721.10
  4. Step 4: Simplify right side
    1,370.32x = 1,482,350.85
  5. Step 5: Solve for x
    x = 1,482,350.85/1,370.32
  6. Step 6: Final answer
    x = 1,081.76

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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.