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Finding the Fourth Proportional to 13,618.40, 20,427.60 and 11,890.40

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Solution

The fourth proportional to 13,618.40, 20,427.60 and 11,890.40 is: 17,835.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,618.40 : 20,427.60 = 11,890.40 : x
  2. Step 2: Convert to fraction form
    13,618.40/20,427.60 = 11,890.40/x
  3. Step 3: Cross multiply
    13,618.40x = 20,427.60 × 11,890.40
  4. Step 4: Simplify right side
    13,618.40x = 242,892,335.04
  5. Step 5: Solve for x
    x = 242,892,335.04/13,618.40
  6. Step 6: Final answer
    x = 17,835.60

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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.