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Finding the Fourth Proportional to 911.79, 1,365.12 and 633.56

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Solution

The fourth proportional to 911.79, 1,365.12 and 633.56 is: 948.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.79 : 1,365.12 = 633.56 : x
  2. Step 2: Convert to fraction form
    911.79/1,365.12 = 633.56/x
  3. Step 3: Cross multiply
    911.79x = 1,365.12 × 633.56
  4. Step 4: Simplify right side
    911.79x = 864,878.60
  5. Step 5: Solve for x
    x = 864,878.60/911.79
  6. Step 6: Final answer
    x = 948.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.