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Finding the Fourth Proportional to 756.39, 1,139.76 and 622.44

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Solution

The fourth proportional to 756.39, 1,139.76 and 622.44 is: 937.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.39 : 1,139.76 = 622.44 : x
  2. Step 2: Convert to fraction form
    756.39/1,139.76 = 622.44/x
  3. Step 3: Cross multiply
    756.39x = 1,139.76 × 622.44
  4. Step 4: Simplify right side
    756.39x = 709,432.21
  5. Step 5: Solve for x
    x = 709,432.21/756.39
  6. Step 6: Final answer
    x = 937.92

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.