Home / 1,147.20-1,720.40-406.64

Finding the Fourth Proportional to 1,147.20, 1,720.40 and 406.64

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Solution

The fourth proportional to 1,147.20, 1,720.40 and 406.64 is: 609.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.20 : 1,720.40 = 406.64 : x
  2. Step 2: Convert to fraction form
    1,147.20/1,720.40 = 406.64/x
  3. Step 3: Cross multiply
    1,147.20x = 1,720.40 × 406.64
  4. Step 4: Simplify right side
    1,147.20x = 699,583.46
  5. Step 5: Solve for x
    x = 699,583.46/1,147.20
  6. Step 6: Final answer
    x = 609.82

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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.