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Finding the Fourth Proportional to 742.70, 1,114.32 and 309.86

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Solution

The fourth proportional to 742.70, 1,114.32 and 309.86 is: 464.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.70 : 1,114.32 = 309.86 : x
  2. Step 2: Convert to fraction form
    742.70/1,114.32 = 309.86/x
  3. Step 3: Cross multiply
    742.70x = 1,114.32 × 309.86
  4. Step 4: Simplify right side
    742.70x = 345,283.20
  5. Step 5: Solve for x
    x = 345,283.20/742.70
  6. Step 6: Final answer
    x = 464.90

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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.