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Finding the Fourth Proportional to 45,609.85, 68,413.28 and 20,649.90

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Solution

The fourth proportional to 45,609.85, 68,413.28 and 20,649.90 is: 30,974.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,609.85 : 68,413.28 = 20,649.90 : x
  2. Step 2: Convert to fraction form
    45,609.85/68,413.28 = 20,649.90/x
  3. Step 3: Cross multiply
    45,609.85x = 68,413.28 × 20,649.90
  4. Step 4: Simplify right side
    45,609.85x = 1,412,727,287.42
  5. Step 5: Solve for x
    x = 1,412,727,287.42/45,609.85
  6. Step 6: Final answer
    x = 30,974.17

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Similar ratio
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1.5x scale

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.