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Finding the Fourth Proportional to 139,888.95, 193,040.17 and 79,451.74

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Solution

The fourth proportional to 139,888.95, 193,040.17 and 79,451.74 is: 109,639.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,888.95 : 193,040.17 = 79,451.74 : x
  2. Step 2: Convert to fraction form
    139,888.95/193,040.17 = 79,451.74/x
  3. Step 3: Cross multiply
    139,888.95x = 193,040.17 × 79,451.74
  4. Step 4: Simplify right side
    139,888.95x = 15,337,377,396.40
  5. Step 5: Solve for x
    x = 15,337,377,396.40/139,888.95
  6. Step 6: Final answer
    x = 109,639.66

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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.