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Finding the Fourth Proportional to 1,089.28, 1,632.42 and 439.84

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Solution

The fourth proportional to 1,089.28, 1,632.42 and 439.84 is: 659.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.28 : 1,632.42 = 439.84 : x
  2. Step 2: Convert to fraction form
    1,089.28/1,632.42 = 439.84/x
  3. Step 3: Cross multiply
    1,089.28x = 1,632.42 × 439.84
  4. Step 4: Simplify right side
    1,089.28x = 718,003.61
  5. Step 5: Solve for x
    x = 718,003.61/1,089.28
  6. Step 6: Final answer
    x = 659.15

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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.