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Finding the Fourth Proportional to 1,106.91, 1,660.28 and 413.55

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Solution

The fourth proportional to 1,106.91, 1,660.28 and 413.55 is: 620.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,106.91 : 1,660.28 = 413.55 : x
  2. Step 2: Convert to fraction form
    1,106.91/1,660.28 = 413.55/x
  3. Step 3: Cross multiply
    1,106.91x = 1,660.28 × 413.55
  4. Step 4: Simplify right side
    1,106.91x = 686,606.73
  5. Step 5: Solve for x
    x = 686,606.73/1,106.91
  6. Step 6: Final answer
    x = 620.29

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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.