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Finding the Fourth Proportional to 1,329.12, 1,994.01 and 404.67

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Solution

The fourth proportional to 1,329.12, 1,994.01 and 404.67 is: 607.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.12 : 1,994.01 = 404.67 : x
  2. Step 2: Convert to fraction form
    1,329.12/1,994.01 = 404.67/x
  3. Step 3: Cross multiply
    1,329.12x = 1,994.01 × 404.67
  4. Step 4: Simplify right side
    1,329.12x = 806,916.03
  5. Step 5: Solve for x
    x = 806,916.03/1,329.12
  6. Step 6: Final answer
    x = 607.11

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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.