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Finding the Fourth Proportional to 1,133.20, 1,698.60 and 439.60

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Solution

The fourth proportional to 1,133.20, 1,698.60 and 439.60 is: 658.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,133.20 : 1,698.60 = 439.60 : x
  2. Step 2: Convert to fraction form
    1,133.20/1,698.60 = 439.60/x
  3. Step 3: Cross multiply
    1,133.20x = 1,698.60 × 439.60
  4. Step 4: Simplify right side
    1,133.20x = 746,704.56
  5. Step 5: Solve for x
    x = 746,704.56/1,133.20
  6. Step 6: Final answer
    x = 658.93

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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.