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Finding the Fourth Proportional to 911.53, 1,258.01 and 518.50

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Solution

The fourth proportional to 911.53, 1,258.01 and 518.50 is: 715.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.53 : 1,258.01 = 518.50 : x
  2. Step 2: Convert to fraction form
    911.53/1,258.01 = 518.50/x
  3. Step 3: Cross multiply
    911.53x = 1,258.01 × 518.50
  4. Step 4: Simplify right side
    911.53x = 652,278.19
  5. Step 5: Solve for x
    x = 652,278.19/911.53
  6. Step 6: Final answer
    x = 715.59

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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.