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Finding the Fourth Proportional to 911.68, 1,258.81 and 909.86

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Solution

The fourth proportional to 911.68, 1,258.81 and 909.86 is: 1,256.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.68 : 1,258.81 = 909.86 : x
  2. Step 2: Convert to fraction form
    911.68/1,258.81 = 909.86/x
  3. Step 3: Cross multiply
    911.68x = 1,258.81 × 909.86
  4. Step 4: Simplify right side
    911.68x = 1,145,332.30
  5. Step 5: Solve for x
    x = 1,145,332.30/911.68
  6. Step 6: Final answer
    x = 1,256.29

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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.