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Finding the Fourth Proportional to 12,809.60, 19,214.40 and 12,129.20

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Solution

The fourth proportional to 12,809.60, 19,214.40 and 12,129.20 is: 18,193.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,809.60 : 19,214.40 = 12,129.20 : x
  2. Step 2: Convert to fraction form
    12,809.60/19,214.40 = 12,129.20/x
  3. Step 3: Cross multiply
    12,809.60x = 19,214.40 × 12,129.20
  4. Step 4: Simplify right side
    12,809.60x = 233,055,300.48
  5. Step 5: Solve for x
    x = 233,055,300.48/12,809.60
  6. Step 6: Final answer
    x = 18,193.80

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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.