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Finding the Fourth Proportional to 12,036.60, 18,054.90 and 9,120.60

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Solution

The fourth proportional to 12,036.60, 18,054.90 and 9,120.60 is: 13,680.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,036.60 : 18,054.90 = 9,120.60 : x
  2. Step 2: Convert to fraction form
    12,036.60/18,054.90 = 9,120.60/x
  3. Step 3: Cross multiply
    12,036.60x = 18,054.90 × 9,120.60
  4. Step 4: Simplify right side
    12,036.60x = 164,671,520.94
  5. Step 5: Solve for x
    x = 164,671,520.94/12,036.60
  6. Step 6: Final answer
    x = 13,680.90

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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.