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Finding the Fourth Proportional to 1,089.28, 1,634.48 and 440.48

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Solution

The fourth proportional to 1,089.28, 1,634.48 and 440.48 is: 660.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.28 : 1,634.48 = 440.48 : x
  2. Step 2: Convert to fraction form
    1,089.28/1,634.48 = 440.48/x
  3. Step 3: Cross multiply
    1,089.28x = 1,634.48 × 440.48
  4. Step 4: Simplify right side
    1,089.28x = 719,955.75
  5. Step 5: Solve for x
    x = 719,955.75/1,089.28
  6. Step 6: Final answer
    x = 660.95

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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.