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Finding the Fourth Proportional to 2,119.52, 3,178.44 and 658.28

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Solution

The fourth proportional to 2,119.52, 3,178.44 and 658.28 is: 987.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,119.52 : 3,178.44 = 658.28 : x
  2. Step 2: Convert to fraction form
    2,119.52/3,178.44 = 658.28/x
  3. Step 3: Cross multiply
    2,119.52x = 3,178.44 × 658.28
  4. Step 4: Simplify right side
    2,119.52x = 2,092,311.43
  5. Step 5: Solve for x
    x = 2,092,311.43/2,119.52
  6. Step 6: Final answer
    x = 987.16

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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.