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Finding the Fourth Proportional to 742.07, 1,113.78 and 395.70

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Solution

The fourth proportional to 742.07, 1,113.78 and 395.70 is: 593.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.07 : 1,113.78 = 395.70 : x
  2. Step 2: Convert to fraction form
    742.07/1,113.78 = 395.70/x
  3. Step 3: Cross multiply
    742.07x = 1,113.78 × 395.70
  4. Step 4: Simplify right side
    742.07x = 440,716.19
  5. Step 5: Solve for x
    x = 440,716.19/742.07
  6. Step 6: Final answer
    x = 593.90

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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.