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Finding the Fourth Proportional to 19,526.80, 29,311.80 and 12,139.60

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Solution

The fourth proportional to 19,526.80, 29,311.80 and 12,139.60 is: 18,222.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,526.80 : 29,311.80 = 12,139.60 : x
  2. Step 2: Convert to fraction form
    19,526.80/29,311.80 = 12,139.60/x
  3. Step 3: Cross multiply
    19,526.80x = 29,311.80 × 12,139.60
  4. Step 4: Simplify right side
    19,526.80x = 355,833,527.28
  5. Step 5: Solve for x
    x = 355,833,527.28/19,526.80
  6. Step 6: Final answer
    x = 18,222.83

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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.