Home / 1,452.21-2,177.78-721.40

Finding the Fourth Proportional to 1,452.21, 2,177.78 and 721.40

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Solution

The fourth proportional to 1,452.21, 2,177.78 and 721.40 is: 1,081.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,452.21 : 2,177.78 = 721.40 : x
  2. Step 2: Convert to fraction form
    1,452.21/2,177.78 = 721.40/x
  3. Step 3: Cross multiply
    1,452.21x = 2,177.78 × 721.40
  4. Step 4: Simplify right side
    1,452.21x = 1,571,036.00
  5. Step 5: Solve for x
    x = 1,571,036.00/1,452.21
  6. Step 6: Final answer
    x = 1,081.82

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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.