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Finding the Fourth Proportional to 82,108.80, 123,163.20 and 78,828.30

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Solution

The fourth proportional to 82,108.80, 123,163.20 and 78,828.30 is: 118,242.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,108.80 : 123,163.20 = 78,828.30 : x
  2. Step 2: Convert to fraction form
    82,108.80/123,163.20 = 78,828.30/x
  3. Step 3: Cross multiply
    82,108.80x = 123,163.20 × 78,828.30
  4. Step 4: Simplify right side
    82,108.80x = 9,708,745,678.56
  5. Step 5: Solve for x
    x = 9,708,745,678.56/82,108.80
  6. Step 6: Final answer
    x = 118,242.45

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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.