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Finding the Fourth Proportional to 742.42, 1,114.13 and 280.22

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Solution

The fourth proportional to 742.42, 1,114.13 and 280.22 is: 420.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.42 : 1,114.13 = 280.22 : x
  2. Step 2: Convert to fraction form
    742.42/1,114.13 = 280.22/x
  3. Step 3: Cross multiply
    742.42x = 1,114.13 × 280.22
  4. Step 4: Simplify right side
    742.42x = 312,198.98
  5. Step 5: Solve for x
    x = 312,198.98/742.42
  6. Step 6: Final answer
    x = 420.51

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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.