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Finding the Fourth Proportional to 981.36, 1,353.56 and 622.33

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Solution

The fourth proportional to 981.36, 1,353.56 and 622.33 is: 858.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.36 : 1,353.56 = 622.33 : x
  2. Step 2: Convert to fraction form
    981.36/1,353.56 = 622.33/x
  3. Step 3: Cross multiply
    981.36x = 1,353.56 × 622.33
  4. Step 4: Simplify right side
    981.36x = 842,360.99
  5. Step 5: Solve for x
    x = 842,360.99/981.36
  6. Step 6: Final answer
    x = 858.36

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1.5x scale

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.