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Finding the Fourth Proportional to 911.61, 1,258.30 and 616.87

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Solution

The fourth proportional to 911.61, 1,258.30 and 616.87 is: 851.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.61 : 1,258.30 = 616.87 : x
  2. Step 2: Convert to fraction form
    911.61/1,258.30 = 616.87/x
  3. Step 3: Cross multiply
    911.61x = 1,258.30 × 616.87
  4. Step 4: Simplify right side
    911.61x = 776,209.86
  5. Step 5: Solve for x
    x = 776,209.86/911.61
  6. Step 6: Final answer
    x = 851.47

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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.