Home / 138,942.69-208,243.05-79,021.45

Finding the Fourth Proportional to 138,942.69, 208,243.05 and 79,021.45

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Solution

The fourth proportional to 138,942.69, 208,243.05 and 79,021.45 is: 118,434.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,942.69 : 208,243.05 = 79,021.45 : x
  2. Step 2: Convert to fraction form
    138,942.69/208,243.05 = 79,021.45/x
  3. Step 3: Cross multiply
    138,942.69x = 208,243.05 × 79,021.45
  4. Step 4: Simplify right side
    138,942.69x = 16,455,667,763.42
  5. Step 5: Solve for x
    x = 16,455,667,763.42/138,942.69
  6. Step 6: Final answer
    x = 118,434.93

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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.