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Finding the Fourth Proportional to 102,698.80, 154,163.40 and 79,428.40

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Solution

The fourth proportional to 102,698.80, 154,163.40 and 79,428.40 is: 119,231.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,698.80 : 154,163.40 = 79,428.40 : x
  2. Step 2: Convert to fraction form
    102,698.80/154,163.40 = 79,428.40/x
  3. Step 3: Cross multiply
    102,698.80x = 154,163.40 × 79,428.40
  4. Step 4: Simplify right side
    102,698.80x = 12,244,952,200.56
  5. Step 5: Solve for x
    x = 12,244,952,200.56/102,698.80
  6. Step 6: Final answer
    x = 119,231.70

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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.