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Finding the Fourth Proportional to 69,136.72, 103,687.80 and 19,888.72

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Solution

The fourth proportional to 69,136.72, 103,687.80 and 19,888.72 is: 29,828.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,136.72 : 103,687.80 = 19,888.72 : x
  2. Step 2: Convert to fraction form
    69,136.72/103,687.80 = 19,888.72/x
  3. Step 3: Cross multiply
    69,136.72x = 103,687.80 × 19,888.72
  4. Step 4: Simplify right side
    69,136.72x = 2,062,217,621.62
  5. Step 5: Solve for x
    x = 2,062,217,621.62/69,136.72
  6. Step 6: Final answer
    x = 29,828.11

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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.