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Finding the Fourth Proportional to 12,936.60, 19,407.60 and 7,385.40

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Solution

The fourth proportional to 12,936.60, 19,407.60 and 7,385.40 is: 11,079.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,936.60 : 19,407.60 = 7,385.40 : x
  2. Step 2: Convert to fraction form
    12,936.60/19,407.60 = 7,385.40/x
  3. Step 3: Cross multiply
    12,936.60x = 19,407.60 × 7,385.40
  4. Step 4: Simplify right side
    12,936.60x = 143,332,889.04
  5. Step 5: Solve for x
    x = 143,332,889.04/12,936.60
  6. Step 6: Final answer
    x = 11,079.64

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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.