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Finding the Fourth Proportional to 1,328.73, 1,992.74 and 404.34

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Solution

The fourth proportional to 1,328.73, 1,992.74 and 404.34 is: 606.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.73 : 1,992.74 = 404.34 : x
  2. Step 2: Convert to fraction form
    1,328.73/1,992.74 = 404.34/x
  3. Step 3: Cross multiply
    1,328.73x = 1,992.74 × 404.34
  4. Step 4: Simplify right side
    1,328.73x = 805,742.47
  5. Step 5: Solve for x
    x = 805,742.47/1,328.73
  6. Step 6: Final answer
    x = 606.40

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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.