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Finding the Fourth Proportional to 19,230.40, 28,856.40 and 8,135.20

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Solution

The fourth proportional to 19,230.40, 28,856.40 and 8,135.20 is: 12,207.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,230.40 : 28,856.40 = 8,135.20 : x
  2. Step 2: Convert to fraction form
    19,230.40/28,856.40 = 8,135.20/x
  3. Step 3: Cross multiply
    19,230.40x = 28,856.40 × 8,135.20
  4. Step 4: Simplify right side
    19,230.40x = 234,752,585.28
  5. Step 5: Solve for x
    x = 234,752,585.28/19,230.40
  6. Step 6: Final answer
    x = 12,207.37

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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.