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Finding the Fourth Proportional to 12,778.40, 19,167.60 and 12,220.80

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Solution

The fourth proportional to 12,778.40, 19,167.60 and 12,220.80 is: 18,331.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,778.40 : 19,167.60 = 12,220.80 : x
  2. Step 2: Convert to fraction form
    12,778.40/19,167.60 = 12,220.80/x
  3. Step 3: Cross multiply
    12,778.40x = 19,167.60 × 12,220.80
  4. Step 4: Simplify right side
    12,778.40x = 234,243,406.08
  5. Step 5: Solve for x
    x = 234,243,406.08/12,778.40
  6. Step 6: Final answer
    x = 18,331.20

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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.