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Finding the Fourth Proportional to 1,328.29, 1,991.65 and 403.58

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Solution

The fourth proportional to 1,328.29, 1,991.65 and 403.58 is: 605.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.29 : 1,991.65 = 403.58 : x
  2. Step 2: Convert to fraction form
    1,328.29/1,991.65 = 403.58/x
  3. Step 3: Cross multiply
    1,328.29x = 1,991.65 × 403.58
  4. Step 4: Simplify right side
    1,328.29x = 803,790.11
  5. Step 5: Solve for x
    x = 803,790.11/1,328.29
  6. Step 6: Final answer
    x = 605.13

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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.