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Finding the Fourth Proportional to 911.35, 1,257.05 and 627.62

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Solution

The fourth proportional to 911.35, 1,257.05 and 627.62 is: 865.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.35 : 1,257.05 = 627.62 : x
  2. Step 2: Convert to fraction form
    911.35/1,257.05 = 627.62/x
  3. Step 3: Cross multiply
    911.35x = 1,257.05 × 627.62
  4. Step 4: Simplify right side
    911.35x = 788,945.00
  5. Step 5: Solve for x
    x = 788,945.00/911.35
  6. Step 6: Final answer
    x = 865.69

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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.