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Finding the Fourth Proportional to 1,328.40, 1,992.44 and 354.57

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Solution

The fourth proportional to 1,328.40, 1,992.44 and 354.57 is: 531.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.40 : 1,992.44 = 354.57 : x
  2. Step 2: Convert to fraction form
    1,328.40/1,992.44 = 354.57/x
  3. Step 3: Cross multiply
    1,328.40x = 1,992.44 × 354.57
  4. Step 4: Simplify right side
    1,328.40x = 706,459.45
  5. Step 5: Solve for x
    x = 706,459.45/1,328.40
  6. Step 6: Final answer
    x = 531.81

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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.