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Finding the Fourth Proportional to 1,452.26, 2,178.39 and 721.10

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Solution

The fourth proportional to 1,452.26, 2,178.39 and 721.10 is: 1,081.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,452.26 : 2,178.39 = 721.10 : x
  2. Step 2: Convert to fraction form
    1,452.26/2,178.39 = 721.10/x
  3. Step 3: Cross multiply
    1,452.26x = 2,178.39 × 721.10
  4. Step 4: Simplify right side
    1,452.26x = 1,570,826.14
  5. Step 5: Solve for x
    x = 1,570,826.14/1,452.26
  6. Step 6: Final answer
    x = 1,081.65

Related Problems

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Double scale
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Similar ratio
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1.5x scale

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.