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Finding the Fourth Proportional to 12,838.60, 19,260.60 and 7,287.40

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Solution

The fourth proportional to 12,838.60, 19,260.60 and 7,287.40 is: 10,932.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,838.60 : 19,260.60 = 7,287.40 : x
  2. Step 2: Convert to fraction form
    12,838.60/19,260.60 = 7,287.40/x
  3. Step 3: Cross multiply
    12,838.60x = 19,260.60 × 7,287.40
  4. Step 4: Simplify right side
    12,838.60x = 140,359,696.44
  5. Step 5: Solve for x
    x = 140,359,696.44/12,838.60
  6. Step 6: Final answer
    x = 10,932.63

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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.