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Finding the Fourth Proportional to 1,089.42, 1,635.30 and 603.42

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Solution

The fourth proportional to 1,089.42, 1,635.30 and 603.42 is: 905.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.42 : 1,635.30 = 603.42 : x
  2. Step 2: Convert to fraction form
    1,089.42/1,635.30 = 603.42/x
  3. Step 3: Cross multiply
    1,089.42x = 1,635.30 × 603.42
  4. Step 4: Simplify right side
    1,089.42x = 986,772.73
  5. Step 5: Solve for x
    x = 986,772.73/1,089.42
  6. Step 6: Final answer
    x = 905.78

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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.