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Finding the Fourth Proportional to 1,107.82, 1,528.26 and 665.64

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Solution

The fourth proportional to 1,107.82, 1,528.26 and 665.64 is: 918.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.82 : 1,528.26 = 665.64 : x
  2. Step 2: Convert to fraction form
    1,107.82/1,528.26 = 665.64/x
  3. Step 3: Cross multiply
    1,107.82x = 1,528.26 × 665.64
  4. Step 4: Simplify right side
    1,107.82x = 1,017,270.99
  5. Step 5: Solve for x
    x = 1,017,270.99/1,107.82
  6. Step 6: Final answer
    x = 918.26

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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.