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Finding the Fourth Proportional to 128,923.62, 193,443.44 and 69,689.94

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Solution

The fourth proportional to 128,923.62, 193,443.44 and 69,689.94 is: 104,566.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,923.62 : 193,443.44 = 69,689.94 : x
  2. Step 2: Convert to fraction form
    128,923.62/193,443.44 = 69,689.94/x
  3. Step 3: Cross multiply
    128,923.62x = 193,443.44 × 69,689.94
  4. Step 4: Simplify right side
    128,923.62x = 13,481,061,726.99
  5. Step 5: Solve for x
    x = 13,481,061,726.99/128,923.62
  6. Step 6: Final answer
    x = 104,566.27

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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.