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Finding the Fourth Proportional to 12,840.80, 19,261.20 and 11,890.40

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Solution

The fourth proportional to 12,840.80, 19,261.20 and 11,890.40 is: 17,835.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,840.80 : 19,261.20 = 11,890.40 : x
  2. Step 2: Convert to fraction form
    12,840.80/19,261.20 = 11,890.40/x
  3. Step 3: Cross multiply
    12,840.80x = 19,261.20 × 11,890.40
  4. Step 4: Simplify right side
    12,840.80x = 229,023,372.48
  5. Step 5: Solve for x
    x = 229,023,372.48/12,840.80
  6. Step 6: Final answer
    x = 17,835.60

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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.