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Finding the Fourth Proportional to 742.80, 1,113.48 and 309.54

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Solution

The fourth proportional to 742.80, 1,113.48 and 309.54 is: 464.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.80 : 1,113.48 = 309.54 : x
  2. Step 2: Convert to fraction form
    742.80/1,113.48 = 309.54/x
  3. Step 3: Cross multiply
    742.80x = 1,113.48 × 309.54
  4. Step 4: Simplify right side
    742.80x = 344,666.60
  5. Step 5: Solve for x
    x = 344,666.60/742.80
  6. Step 6: Final answer
    x = 464.01

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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.