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Finding the Fourth Proportional to 79,642.78, 119,465.11 and 20,476.87

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Solution

The fourth proportional to 79,642.78, 119,465.11 and 20,476.87 is: 30,715.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,642.78 : 119,465.11 = 20,476.87 : x
  2. Step 2: Convert to fraction form
    79,642.78/119,465.11 = 20,476.87/x
  3. Step 3: Cross multiply
    79,642.78x = 119,465.11 × 20,476.87
  4. Step 4: Simplify right side
    79,642.78x = 2,446,271,253.94
  5. Step 5: Solve for x
    x = 2,446,271,253.94/79,642.78
  6. Step 6: Final answer
    x = 30,715.54

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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.