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Finding the Fourth Proportional to 1,328.45, 1,992.37 and 391.15

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Solution

The fourth proportional to 1,328.45, 1,992.37 and 391.15 is: 586.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.45 : 1,992.37 = 391.15 : x
  2. Step 2: Convert to fraction form
    1,328.45/1,992.37 = 391.15/x
  3. Step 3: Cross multiply
    1,328.45x = 1,992.37 × 391.15
  4. Step 4: Simplify right side
    1,328.45x = 779,324.48
  5. Step 5: Solve for x
    x = 779,324.48/1,328.45
  6. Step 6: Final answer
    x = 586.64

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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.