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Finding the Fourth Proportional to 1,099.28, 1,648.37 and 405.92

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Solution

The fourth proportional to 1,099.28, 1,648.37 and 405.92 is: 608.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.28 : 1,648.37 = 405.92 : x
  2. Step 2: Convert to fraction form
    1,099.28/1,648.37 = 405.92/x
  3. Step 3: Cross multiply
    1,099.28x = 1,648.37 × 405.92
  4. Step 4: Simplify right side
    1,099.28x = 669,106.35
  5. Step 5: Solve for x
    x = 669,106.35/1,099.28
  6. Step 6: Final answer
    x = 608.68

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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.