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Finding the Fourth Proportional to 11,990.40, 17,980.20 and 5,413.20

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Solution

The fourth proportional to 11,990.40, 17,980.20 and 5,413.20 is: 8,117.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,990.40 : 17,980.20 = 5,413.20 : x
  2. Step 2: Convert to fraction form
    11,990.40/17,980.20 = 5,413.20/x
  3. Step 3: Cross multiply
    11,990.40x = 17,980.20 × 5,413.20
  4. Step 4: Simplify right side
    11,990.40x = 97,330,418.64
  5. Step 5: Solve for x
    x = 97,330,418.64/11,990.40
  6. Step 6: Final answer
    x = 8,117.36

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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.