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Finding the Fourth Proportional to 1,059.28, 1,589.12 and 328.69

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Solution

The fourth proportional to 1,059.28, 1,589.12 and 328.69 is: 493.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,059.28 : 1,589.12 = 328.69 : x
  2. Step 2: Convert to fraction form
    1,059.28/1,589.12 = 328.69/x
  3. Step 3: Cross multiply
    1,059.28x = 1,589.12 × 328.69
  4. Step 4: Simplify right side
    1,059.28x = 522,327.85
  5. Step 5: Solve for x
    x = 522,327.85/1,059.28
  6. Step 6: Final answer
    x = 493.10

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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.