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Finding the Fourth Proportional to 1,015.80, 1,401.12 and 622.32

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Solution

The fourth proportional to 1,015.80, 1,401.12 and 622.32 is: 858.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.80 : 1,401.12 = 622.32 : x
  2. Step 2: Convert to fraction form
    1,015.80/1,401.12 = 622.32/x
  3. Step 3: Cross multiply
    1,015.80x = 1,401.12 × 622.32
  4. Step 4: Simplify right side
    1,015.80x = 871,945.00
  5. Step 5: Solve for x
    x = 871,945.00/1,015.80
  6. Step 6: Final answer
    x = 858.38

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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.