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Finding the Fourth Proportional to 1,328.48, 1,992.72 and 404.08

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Solution

The fourth proportional to 1,328.48, 1,992.72 and 404.08 is: 606.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.48 : 1,992.72 = 404.08 : x
  2. Step 2: Convert to fraction form
    1,328.48/1,992.72 = 404.08/x
  3. Step 3: Cross multiply
    1,328.48x = 1,992.72 × 404.08
  4. Step 4: Simplify right side
    1,328.48x = 805,218.30
  5. Step 5: Solve for x
    x = 805,218.30/1,328.48
  6. Step 6: Final answer
    x = 606.12

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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.