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Finding the Fourth Proportional to 911.45, 1,257.44 and 662.22

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Solution

The fourth proportional to 911.45, 1,257.44 and 662.22 is: 913.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.45 : 1,257.44 = 662.22 : x
  2. Step 2: Convert to fraction form
    911.45/1,257.44 = 662.22/x
  3. Step 3: Cross multiply
    911.45x = 1,257.44 × 662.22
  4. Step 4: Simplify right side
    911.45x = 832,698.61
  5. Step 5: Solve for x
    x = 832,698.61/911.45
  6. Step 6: Final answer
    x = 913.60

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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.