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Finding the Fourth Proportional to 1,106.96, 1,660.71 and 413.66

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Solution

The fourth proportional to 1,106.96, 1,660.71 and 413.66 is: 620.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.96 : 1,660.71 = 413.66 : x
  2. Step 2: Convert to fraction form
    1,106.96/1,660.71 = 413.66/x
  3. Step 3: Cross multiply
    1,106.96x = 1,660.71 × 413.66
  4. Step 4: Simplify right side
    1,106.96x = 686,969.30
  5. Step 5: Solve for x
    x = 686,969.30/1,106.96
  6. Step 6: Final answer
    x = 620.59

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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.