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Finding the Fourth Proportional to 19,141.65, 28,719.05 and 8,619.05

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Solution

The fourth proportional to 19,141.65, 28,719.05 and 8,619.05 is: 12,931.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,141.65 : 28,719.05 = 8,619.05 : x
  2. Step 2: Convert to fraction form
    19,141.65/28,719.05 = 8,619.05/x
  3. Step 3: Cross multiply
    19,141.65x = 28,719.05 × 8,619.05
  4. Step 4: Simplify right side
    19,141.65x = 247,530,927.90
  5. Step 5: Solve for x
    x = 247,530,927.90/19,141.65
  6. Step 6: Final answer
    x = 12,931.54

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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.