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Finding the Fourth Proportional to 1,107.28, 1,660.35 and 645.15

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Solution

The fourth proportional to 1,107.28, 1,660.35 and 645.15 is: 967.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.28 : 1,660.35 = 645.15 : x
  2. Step 2: Convert to fraction form
    1,107.28/1,660.35 = 645.15/x
  3. Step 3: Cross multiply
    1,107.28x = 1,660.35 × 645.15
  4. Step 4: Simplify right side
    1,107.28x = 1,071,174.80
  5. Step 5: Solve for x
    x = 1,071,174.80/1,107.28
  6. Step 6: Final answer
    x = 967.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.