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Finding the Fourth Proportional to 139,428.51, 192,410.84 and 79,010.66

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Solution

The fourth proportional to 139,428.51, 192,410.84 and 79,010.66 is: 109,034.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,428.51 : 192,410.84 = 79,010.66 : x
  2. Step 2: Convert to fraction form
    139,428.51/192,410.84 = 79,010.66/x
  3. Step 3: Cross multiply
    139,428.51x = 192,410.84 × 79,010.66
  4. Step 4: Simplify right side
    139,428.51x = 15,202,506,102.45
  5. Step 5: Solve for x
    x = 15,202,506,102.45/139,428.51
  6. Step 6: Final answer
    x = 109,034.42

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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.