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Finding the Fourth Proportional to 943.20, 1,415.21 and 613.53

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Solution

The fourth proportional to 943.20, 1,415.21 and 613.53 is: 920.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.20 : 1,415.21 = 613.53 : x
  2. Step 2: Convert to fraction form
    943.20/1,415.21 = 613.53/x
  3. Step 3: Cross multiply
    943.20x = 1,415.21 × 613.53
  4. Step 4: Simplify right side
    943.20x = 868,270.72
  5. Step 5: Solve for x
    x = 868,270.72/943.20
  6. Step 6: Final answer
    x = 920.56

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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.