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Finding the Fourth Proportional to 919.45, 1,267.81 and 624.88

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Solution

The fourth proportional to 919.45, 1,267.81 and 624.88 is: 861.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.45 : 1,267.81 = 624.88 : x
  2. Step 2: Convert to fraction form
    919.45/1,267.81 = 624.88/x
  3. Step 3: Cross multiply
    919.45x = 1,267.81 × 624.88
  4. Step 4: Simplify right side
    919.45x = 792,229.11
  5. Step 5: Solve for x
    x = 792,229.11/919.45
  6. Step 6: Final answer
    x = 861.63

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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.