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Finding the Fourth Proportional to 19,236.40, 28,865.40 and 8,141.20

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Solution

The fourth proportional to 19,236.40, 28,865.40 and 8,141.20 is: 12,216.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,236.40 : 28,865.40 = 8,141.20 : x
  2. Step 2: Convert to fraction form
    19,236.40/28,865.40 = 8,141.20/x
  3. Step 3: Cross multiply
    19,236.40x = 28,865.40 × 8,141.20
  4. Step 4: Simplify right side
    19,236.40x = 234,998,994.48
  5. Step 5: Solve for x
    x = 234,998,994.48/19,236.40
  6. Step 6: Final answer
    x = 12,216.37

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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.