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Finding the Fourth Proportional to 1,015.52, 1,401 and 622.40

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Solution

The fourth proportional to 1,015.52, 1,401 and 622.40 is: 858.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.52 : 1,401 = 622.40 : x
  2. Step 2: Convert to fraction form
    1,015.52/1,401 = 622.40/x
  3. Step 3: Cross multiply
    1,015.52x = 1,401 × 622.40
  4. Step 4: Simplify right side
    1,015.52x = 871,982.40
  5. Step 5: Solve for x
    x = 871,982.40/1,015.52
  6. Step 6: Final answer
    x = 858.66

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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.