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Finding the Fourth Proportional to 69,939.65, 96,513.12 and 39,720.98

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Solution

The fourth proportional to 69,939.65, 96,513.12 and 39,720.98 is: 54,812.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,939.65 : 96,513.12 = 39,720.98 : x
  2. Step 2: Convert to fraction form
    69,939.65/96,513.12 = 39,720.98/x
  3. Step 3: Cross multiply
    69,939.65x = 96,513.12 × 39,720.98
  4. Step 4: Simplify right side
    69,939.65x = 3,833,595,950.54
  5. Step 5: Solve for x
    x = 3,833,595,950.54/69,939.65
  6. Step 6: Final answer
    x = 54,812.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.