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Finding the Fourth Proportional to 138,789, 191,528.82 and 79,173

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Solution

The fourth proportional to 138,789, 191,528.82 and 79,173 is: 109,258.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,789 : 191,528.82 = 79,173 : x
  2. Step 2: Convert to fraction form
    138,789/191,528.82 = 79,173/x
  3. Step 3: Cross multiply
    138,789x = 191,528.82 × 79,173
  4. Step 4: Simplify right side
    138,789x = 15,163,911,265.86
  5. Step 5: Solve for x
    x = 15,163,911,265.86/138,789
  6. Step 6: Final answer
    x = 109,258.74

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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.