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Finding the Fourth Proportional to 1,329.80, 1,994.68 and 355.88

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Solution

The fourth proportional to 1,329.80, 1,994.68 and 355.88 is: 533.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.80 : 1,994.68 = 355.88 : x
  2. Step 2: Convert to fraction form
    1,329.80/1,994.68 = 355.88/x
  3. Step 3: Cross multiply
    1,329.80x = 1,994.68 × 355.88
  4. Step 4: Simplify right side
    1,329.80x = 709,855.86
  5. Step 5: Solve for x
    x = 709,855.86/1,329.80
  6. Step 6: Final answer
    x = 533.81

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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.