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Finding the Fourth Proportional to 911.53, 1,258.01 and 557.69

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Solution

The fourth proportional to 911.53, 1,258.01 and 557.69 is: 769.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.53 : 1,258.01 = 557.69 : x
  2. Step 2: Convert to fraction form
    911.53/1,258.01 = 557.69/x
  3. Step 3: Cross multiply
    911.53x = 1,258.01 × 557.69
  4. Step 4: Simplify right side
    911.53x = 701,572.88
  5. Step 5: Solve for x
    x = 701,572.88/911.53
  6. Step 6: Final answer
    x = 769.67

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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.