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Finding the Fourth Proportional to 1,107.87, 1,528.28 and 665.49

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Solution

The fourth proportional to 1,107.87, 1,528.28 and 665.49 is: 918.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.87 : 1,528.28 = 665.49 : x
  2. Step 2: Convert to fraction form
    1,107.87/1,528.28 = 665.49/x
  3. Step 3: Cross multiply
    1,107.87x = 1,528.28 × 665.49
  4. Step 4: Simplify right side
    1,107.87x = 1,017,051.73
  5. Step 5: Solve for x
    x = 1,017,051.73/1,107.87
  6. Step 6: Final answer
    x = 918.02

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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.