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Finding the Fourth Proportional to 756.19, 1,139.42 and 622.23

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Solution

The fourth proportional to 756.19, 1,139.42 and 622.23 is: 937.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.19 : 1,139.42 = 622.23 : x
  2. Step 2: Convert to fraction form
    756.19/1,139.42 = 622.23/x
  3. Step 3: Cross multiply
    756.19x = 1,139.42 × 622.23
  4. Step 4: Simplify right side
    756.19x = 708,981.50
  5. Step 5: Solve for x
    x = 708,981.50/756.19
  6. Step 6: Final answer
    x = 937.58

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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.