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Finding the Fourth Proportional to 138,650.28, 191,367 and 87,630.54

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Solution

The fourth proportional to 138,650.28, 191,367 and 87,630.54 is: 120,948.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,650.28 : 191,367 = 87,630.54 : x
  2. Step 2: Convert to fraction form
    138,650.28/191,367 = 87,630.54/x
  3. Step 3: Cross multiply
    138,650.28x = 191,367 × 87,630.54
  4. Step 4: Simplify right side
    138,650.28x = 16,769,593,548.18
  5. Step 5: Solve for x
    x = 16,769,593,548.18/138,650.28
  6. Step 6: Final answer
    x = 120,948.86

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1.5x scale

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.