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Finding the Fourth Proportional to 1,245.22, 1,867.90 and 628.20

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Solution

The fourth proportional to 1,245.22, 1,867.90 and 628.20 is: 942.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.22 : 1,867.90 = 628.20 : x
  2. Step 2: Convert to fraction form
    1,245.22/1,867.90 = 628.20/x
  3. Step 3: Cross multiply
    1,245.22x = 1,867.90 × 628.20
  4. Step 4: Simplify right side
    1,245.22x = 1,173,413.21
  5. Step 5: Solve for x
    x = 1,173,413.21/1,245.22
  6. Step 6: Final answer
    x = 942.34

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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.