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Finding the Fourth Proportional to 1,338.32, 2,007.64 and 413.84

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Solution

The fourth proportional to 1,338.32, 2,007.64 and 413.84 is: 620.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.32 : 2,007.64 = 413.84 : x
  2. Step 2: Convert to fraction form
    1,338.32/2,007.64 = 413.84/x
  3. Step 3: Cross multiply
    1,338.32x = 2,007.64 × 413.84
  4. Step 4: Simplify right side
    1,338.32x = 830,841.74
  5. Step 5: Solve for x
    x = 830,841.74/1,338.32
  6. Step 6: Final answer
    x = 620.81

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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.