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Finding the Fourth Proportional to 69,128.65, 103,692.91 and 19,208.72

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Solution

The fourth proportional to 69,128.65, 103,692.91 and 19,208.72 is: 28,813.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,128.65 : 103,692.91 = 19,208.72 : x
  2. Step 2: Convert to fraction form
    69,128.65/103,692.91 = 19,208.72/x
  3. Step 3: Cross multiply
    69,128.65x = 103,692.91 × 19,208.72
  4. Step 4: Simplify right side
    69,128.65x = 1,991,808,122.20
  5. Step 5: Solve for x
    x = 1,991,808,122.20/69,128.65
  6. Step 6: Final answer
    x = 28,813.06

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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.