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Finding the Fourth Proportional to 18,959.87, 28,427.96 and 8,429.47

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Solution

The fourth proportional to 18,959.87, 28,427.96 and 8,429.47 is: 12,638.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.87 : 28,427.96 = 8,429.47 : x
  2. Step 2: Convert to fraction form
    18,959.87/28,427.96 = 8,429.47/x
  3. Step 3: Cross multiply
    18,959.87x = 28,427.96 × 8,429.47
  4. Step 4: Simplify right side
    18,959.87x = 239,632,585.98
  5. Step 5: Solve for x
    x = 239,632,585.98/18,959.87
  6. Step 6: Final answer
    x = 12,638.93

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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.