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Finding the Fourth Proportional to 911.72, 1,258.12 and 575.23

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Solution

The fourth proportional to 911.72, 1,258.12 and 575.23 is: 793.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.72 : 1,258.12 = 575.23 : x
  2. Step 2: Convert to fraction form
    911.72/1,258.12 = 575.23/x
  3. Step 3: Cross multiply
    911.72x = 1,258.12 × 575.23
  4. Step 4: Simplify right side
    911.72x = 723,705.49
  5. Step 5: Solve for x
    x = 723,705.49/911.72
  6. Step 6: Final answer
    x = 793.78

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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.