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Finding the Fourth Proportional to 793.15, 1,189.86 and 245.20

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Solution

The fourth proportional to 793.15, 1,189.86 and 245.20 is: 367.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.15 : 1,189.86 = 245.20 : x
  2. Step 2: Convert to fraction form
    793.15/1,189.86 = 245.20/x
  3. Step 3: Cross multiply
    793.15x = 1,189.86 × 245.20
  4. Step 4: Simplify right side
    793.15x = 291,753.67
  5. Step 5: Solve for x
    x = 291,753.67/793.15
  6. Step 6: Final answer
    x = 367.84

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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.