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Finding the Fourth Proportional to 1,329.70, 1,994.61 and 405.39

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Solution

The fourth proportional to 1,329.70, 1,994.61 and 405.39 is: 608.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.70 : 1,994.61 = 405.39 : x
  2. Step 2: Convert to fraction form
    1,329.70/1,994.61 = 405.39/x
  3. Step 3: Cross multiply
    1,329.70x = 1,994.61 × 405.39
  4. Step 4: Simplify right side
    1,329.70x = 808,594.95
  5. Step 5: Solve for x
    x = 808,594.95/1,329.70
  6. Step 6: Final answer
    x = 608.10

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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.