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Finding the Fourth Proportional to 12,901.60, 19,352.40 and 12,221.20

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Solution

The fourth proportional to 12,901.60, 19,352.40 and 12,221.20 is: 18,331.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,901.60 : 19,352.40 = 12,221.20 : x
  2. Step 2: Convert to fraction form
    12,901.60/19,352.40 = 12,221.20/x
  3. Step 3: Cross multiply
    12,901.60x = 19,352.40 × 12,221.20
  4. Step 4: Simplify right side
    12,901.60x = 236,509,550.88
  5. Step 5: Solve for x
    x = 236,509,550.88/12,901.60
  6. Step 6: Final answer
    x = 18,331.80

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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.