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Finding the Fourth Proportional to 139,781.40, 192,900.64 and 79,353.84

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Solution

The fourth proportional to 139,781.40, 192,900.64 and 79,353.84 is: 109,509.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,781.40 : 192,900.64 = 79,353.84 : x
  2. Step 2: Convert to fraction form
    139,781.40/192,900.64 = 79,353.84/x
  3. Step 3: Cross multiply
    139,781.40x = 192,900.64 × 79,353.84
  4. Step 4: Simplify right side
    139,781.40x = 15,307,406,522.46
  5. Step 5: Solve for x
    x = 15,307,406,522.46/139,781.40
  6. Step 6: Final answer
    x = 109,509.61

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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.