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Finding the Fourth Proportional to 138,609.03, 191,280.20 and 78,179.48

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Solution

The fourth proportional to 138,609.03, 191,280.20 and 78,179.48 is: 107,887.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,609.03 : 191,280.20 = 78,179.48 : x
  2. Step 2: Convert to fraction form
    138,609.03/191,280.20 = 78,179.48/x
  3. Step 3: Cross multiply
    138,609.03x = 191,280.20 × 78,179.48
  4. Step 4: Simplify right side
    138,609.03x = 14,954,186,570.30
  5. Step 5: Solve for x
    x = 14,954,186,570.30/138,609.03
  6. Step 6: Final answer
    x = 107,887.53

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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.