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Finding the Fourth Proportional to 959.09, 1,322.61 and 622.55

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Solution

The fourth proportional to 959.09, 1,322.61 and 622.55 is: 858.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.09 : 1,322.61 = 622.55 : x
  2. Step 2: Convert to fraction form
    959.09/1,322.61 = 622.55/x
  3. Step 3: Cross multiply
    959.09x = 1,322.61 × 622.55
  4. Step 4: Simplify right side
    959.09x = 823,384.24
  5. Step 5: Solve for x
    x = 823,384.24/959.09
  6. Step 6: Final answer
    x = 858.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.