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Finding the Fourth Proportional to 1,107.56, 1,527.90 and 665.30

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Solution

The fourth proportional to 1,107.56, 1,527.90 and 665.30 is: 917.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.56 : 1,527.90 = 665.30 : x
  2. Step 2: Convert to fraction form
    1,107.56/1,527.90 = 665.30/x
  3. Step 3: Cross multiply
    1,107.56x = 1,527.90 × 665.30
  4. Step 4: Simplify right side
    1,107.56x = 1,016,511.87
  5. Step 5: Solve for x
    x = 1,016,511.87/1,107.56
  6. Step 6: Final answer
    x = 917.79

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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.