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Finding the Fourth Proportional to 69,091, 103,639.20 and 21,738.40

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Solution

The fourth proportional to 69,091, 103,639.20 and 21,738.40 is: 32,608.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,091 : 103,639.20 = 21,738.40 : x
  2. Step 2: Convert to fraction form
    69,091/103,639.20 = 21,738.40/x
  3. Step 3: Cross multiply
    69,091x = 103,639.20 × 21,738.40
  4. Step 4: Simplify right side
    69,091x = 2,252,950,385.28
  5. Step 5: Solve for x
    x = 2,252,950,385.28/69,091
  6. Step 6: Final answer
    x = 32,608.45

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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.