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Finding the Fourth Proportional to 1,099.64, 1,517.26 and 627.40

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Solution

The fourth proportional to 1,099.64, 1,517.26 and 627.40 is: 865.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.64 : 1,517.26 = 627.40 : x
  2. Step 2: Convert to fraction form
    1,099.64/1,517.26 = 627.40/x
  3. Step 3: Cross multiply
    1,099.64x = 1,517.26 × 627.40
  4. Step 4: Simplify right side
    1,099.64x = 951,928.92
  5. Step 5: Solve for x
    x = 951,928.92/1,099.64
  6. Step 6: Final answer
    x = 865.67

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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.