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Finding the Fourth Proportional to 128,418.01, 192,656.17 and 69,252.37

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Solution

The fourth proportional to 128,418.01, 192,656.17 and 69,252.37 is: 103,894.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,418.01 : 192,656.17 = 69,252.37 : x
  2. Step 2: Convert to fraction form
    128,418.01/192,656.17 = 69,252.37/x
  3. Step 3: Cross multiply
    128,418.01x = 192,656.17 × 69,252.37
  4. Step 4: Simplify right side
    128,418.01x = 13,341,895,972.55
  5. Step 5: Solve for x
    x = 13,341,895,972.55/128,418.01
  6. Step 6: Final answer
    x = 103,894.28

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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.