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Finding the Fourth Proportional to 1,328.41, 1,992.64 and 354.65

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Solution

The fourth proportional to 1,328.41, 1,992.64 and 354.65 is: 531.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.41 : 1,992.64 = 354.65 : x
  2. Step 2: Convert to fraction form
    1,328.41/1,992.64 = 354.65/x
  3. Step 3: Cross multiply
    1,328.41x = 1,992.64 × 354.65
  4. Step 4: Simplify right side
    1,328.41x = 706,689.78
  5. Step 5: Solve for x
    x = 706,689.78/1,328.41
  6. Step 6: Final answer
    x = 531.98

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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.