Home / 1,107.20-1,660.90-285.47

Finding the Fourth Proportional to 1,107.20, 1,660.90 and 285.47

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Solution

The fourth proportional to 1,107.20, 1,660.90 and 285.47 is: 428.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.20 : 1,660.90 = 285.47 : x
  2. Step 2: Convert to fraction form
    1,107.20/1,660.90 = 285.47/x
  3. Step 3: Cross multiply
    1,107.20x = 1,660.90 × 285.47
  4. Step 4: Simplify right side
    1,107.20x = 474,130.95
  5. Step 5: Solve for x
    x = 474,130.95/1,107.20
  6. Step 6: Final answer
    x = 428.22

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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.