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Finding the Fourth Proportional to 911.84, 1,258.28 and 518.80

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Solution

The fourth proportional to 911.84, 1,258.28 and 518.80 is: 715.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.84 : 1,258.28 = 518.80 : x
  2. Step 2: Convert to fraction form
    911.84/1,258.28 = 518.80/x
  3. Step 3: Cross multiply
    911.84x = 1,258.28 × 518.80
  4. Step 4: Simplify right side
    911.84x = 652,795.66
  5. Step 5: Solve for x
    x = 652,795.66/911.84
  6. Step 6: Final answer
    x = 715.91

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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.