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Finding the Fourth Proportional to 911.54, 1,258.52 and 631.68

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Solution

The fourth proportional to 911.54, 1,258.52 and 631.68 is: 872.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.54 : 1,258.52 = 631.68 : x
  2. Step 2: Convert to fraction form
    911.54/1,258.52 = 631.68/x
  3. Step 3: Cross multiply
    911.54x = 1,258.52 × 631.68
  4. Step 4: Simplify right side
    911.54x = 794,981.91
  5. Step 5: Solve for x
    x = 794,981.91/911.54
  6. Step 6: Final answer
    x = 872.13

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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.