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Finding the Fourth Proportional to 1,329.86, 1,994.78 and 405.52

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Solution

The fourth proportional to 1,329.86, 1,994.78 and 405.52 is: 608.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.86 : 1,994.78 = 405.52 : x
  2. Step 2: Convert to fraction form
    1,329.86/1,994.78 = 405.52/x
  3. Step 3: Cross multiply
    1,329.86x = 1,994.78 × 405.52
  4. Step 4: Simplify right side
    1,329.86x = 808,923.19
  5. Step 5: Solve for x
    x = 808,923.19/1,329.86
  6. Step 6: Final answer
    x = 608.28

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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.