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Finding the Fourth Proportional to 69,140.72, 103,629.06 and 61,169.10

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Solution

The fourth proportional to 69,140.72, 103,629.06 and 61,169.10 is: 91,681.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,140.72 : 103,629.06 = 61,169.10 : x
  2. Step 2: Convert to fraction form
    69,140.72/103,629.06 = 61,169.10/x
  3. Step 3: Cross multiply
    69,140.72x = 103,629.06 × 61,169.10
  4. Step 4: Simplify right side
    69,140.72x = 6,338,896,334.05
  5. Step 5: Solve for x
    x = 6,338,896,334.05/69,140.72
  6. Step 6: Final answer
    x = 91,681.09

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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.