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Finding the Fourth Proportional to 1,092.70, 1,638.58 and 399.14

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Solution

The fourth proportional to 1,092.70, 1,638.58 and 399.14 is: 598.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,092.70 : 1,638.58 = 399.14 : x
  2. Step 2: Convert to fraction form
    1,092.70/1,638.58 = 399.14/x
  3. Step 3: Cross multiply
    1,092.70x = 1,638.58 × 399.14
  4. Step 4: Simplify right side
    1,092.70x = 654,022.82
  5. Step 5: Solve for x
    x = 654,022.82/1,092.70
  6. Step 6: Final answer
    x = 598.54

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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.