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Finding the Fourth Proportional to 18,679.54, 28,016.43 and 8,289.46

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Solution

The fourth proportional to 18,679.54, 28,016.43 and 8,289.46 is: 12,432.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,679.54 : 28,016.43 = 8,289.46 : x
  2. Step 2: Convert to fraction form
    18,679.54/28,016.43 = 8,289.46/x
  3. Step 3: Cross multiply
    18,679.54x = 28,016.43 × 8,289.46
  4. Step 4: Simplify right side
    18,679.54x = 232,241,075.83
  5. Step 5: Solve for x
    x = 232,241,075.83/18,679.54
  6. Step 6: Final answer
    x = 12,432.91

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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.