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Finding the Fourth Proportional to 742.45, 1,113.44 and 309.50

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Solution

The fourth proportional to 742.45, 1,113.44 and 309.50 is: 464.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.45 : 1,113.44 = 309.50 : x
  2. Step 2: Convert to fraction form
    742.45/1,113.44 = 309.50/x
  3. Step 3: Cross multiply
    742.45x = 1,113.44 × 309.50
  4. Step 4: Simplify right side
    742.45x = 344,609.68
  5. Step 5: Solve for x
    x = 344,609.68/742.45
  6. Step 6: Final answer
    x = 464.15

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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.