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Finding the Fourth Proportional to 1,015.98, 1,401.22 and 622.74

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Solution

The fourth proportional to 1,015.98, 1,401.22 and 622.74 is: 858.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.98 : 1,401.22 = 622.74 : x
  2. Step 2: Convert to fraction form
    1,015.98/1,401.22 = 622.74/x
  3. Step 3: Cross multiply
    1,015.98x = 1,401.22 × 622.74
  4. Step 4: Simplify right side
    1,015.98x = 872,595.74
  5. Step 5: Solve for x
    x = 872,595.74/1,015.98
  6. Step 6: Final answer
    x = 858.87

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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.