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Finding the Fourth Proportional to 45,289.71, 67,912.71 and 18,987.39

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Solution

The fourth proportional to 45,289.71, 67,912.71 and 18,987.39 is: 28,471.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,289.71 : 67,912.71 = 18,987.39 : x
  2. Step 2: Convert to fraction form
    45,289.71/67,912.71 = 18,987.39/x
  3. Step 3: Cross multiply
    45,289.71x = 67,912.71 × 18,987.39
  4. Step 4: Simplify right side
    45,289.71x = 1,289,485,110.73
  5. Step 5: Solve for x
    x = 1,289,485,110.73/45,289.71
  6. Step 6: Final answer
    x = 28,471.92

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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.