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Finding the Fourth Proportional to 911.55, 1,258.64 and 909.73

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Solution

The fourth proportional to 911.55, 1,258.64 and 909.73 is: 1,256.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.55 : 1,258.64 = 909.73 : x
  2. Step 2: Convert to fraction form
    911.55/1,258.64 = 909.73/x
  3. Step 3: Cross multiply
    911.55x = 1,258.64 × 909.73
  4. Step 4: Simplify right side
    911.55x = 1,145,022.57
  5. Step 5: Solve for x
    x = 1,145,022.57/911.55
  6. Step 6: Final answer
    x = 1,256.13

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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.