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Finding the Fourth Proportional to 139,553.51, 192,579.34 and 79,129.53

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Solution

The fourth proportional to 139,553.51, 192,579.34 and 79,129.53 is: 109,196.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,553.51 : 192,579.34 = 79,129.53 : x
  2. Step 2: Convert to fraction form
    139,553.51/192,579.34 = 79,129.53/x
  3. Step 3: Cross multiply
    139,553.51x = 192,579.34 × 79,129.53
  4. Step 4: Simplify right side
    139,553.51x = 15,238,713,186.26
  5. Step 5: Solve for x
    x = 15,238,713,186.26/139,553.51
  6. Step 6: Final answer
    x = 109,196.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.