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Finding the Fourth Proportional to 139,107.84, 191,965.44 and 79,488

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Solution

The fourth proportional to 139,107.84, 191,965.44 and 79,488 is: 109,691.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,107.84 : 191,965.44 = 79,488 : x
  2. Step 2: Convert to fraction form
    139,107.84/191,965.44 = 79,488/x
  3. Step 3: Cross multiply
    139,107.84x = 191,965.44 × 79,488
  4. Step 4: Simplify right side
    139,107.84x = 15,258,948,894.72
  5. Step 5: Solve for x
    x = 15,258,948,894.72/139,107.84
  6. Step 6: Final answer
    x = 109,691.51

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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.