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Finding the Fourth Proportional to 693.42, 1,040.39 and 328.27

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Solution

The fourth proportional to 693.42, 1,040.39 and 328.27 is: 492.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.42 : 1,040.39 = 328.27 : x
  2. Step 2: Convert to fraction form
    693.42/1,040.39 = 328.27/x
  3. Step 3: Cross multiply
    693.42x = 1,040.39 × 328.27
  4. Step 4: Simplify right side
    693.42x = 341,521.98
  5. Step 5: Solve for x
    x = 341,521.98/693.42
  6. Step 6: Final answer
    x = 492.52

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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.