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Finding the Fourth Proportional to 18,211.20, 27,316.80 and 11,990.40

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Solution

The fourth proportional to 18,211.20, 27,316.80 and 11,990.40 is: 17,985.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,211.20 : 27,316.80 = 11,990.40 : x
  2. Step 2: Convert to fraction form
    18,211.20/27,316.80 = 11,990.40/x
  3. Step 3: Cross multiply
    18,211.20x = 27,316.80 × 11,990.40
  4. Step 4: Simplify right side
    18,211.20x = 327,539,358.72
  5. Step 5: Solve for x
    x = 327,539,358.72/18,211.20
  6. Step 6: Final answer
    x = 17,985.60

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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.