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Finding the Fourth Proportional to 1,329.78, 1,994.69 and 405.33

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Solution

The fourth proportional to 1,329.78, 1,994.69 and 405.33 is: 608.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.78 : 1,994.69 = 405.33 : x
  2. Step 2: Convert to fraction form
    1,329.78/1,994.69 = 405.33/x
  3. Step 3: Cross multiply
    1,329.78x = 1,994.69 × 405.33
  4. Step 4: Simplify right side
    1,329.78x = 808,505.67
  5. Step 5: Solve for x
    x = 808,505.67/1,329.78
  6. Step 6: Final answer
    x = 608.00

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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.