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Finding the Fourth Proportional to 12,406.40, 18,609.60 and 7,491.20

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Solution

The fourth proportional to 12,406.40, 18,609.60 and 7,491.20 is: 11,236.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,406.40 : 18,609.60 = 7,491.20 : x
  2. Step 2: Convert to fraction form
    12,406.40/18,609.60 = 7,491.20/x
  3. Step 3: Cross multiply
    12,406.40x = 18,609.60 × 7,491.20
  4. Step 4: Simplify right side
    12,406.40x = 139,408,235.52
  5. Step 5: Solve for x
    x = 139,408,235.52/12,406.40
  6. Step 6: Final answer
    x = 11,236.80

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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.